Why do we not have many fossil records from the precambrian era?

Answers

Answer 1
Most life-forms were single-celled, with no hard parts to fossilize.
Answer 2
Most living parts didnt have bones they were single celled

Related Questions

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey?

The population of predators will be uniform with no change.

The population of predators will increase first and then decrease slowly.

The population of predators will increase continuously.

Answers

I think the answer is the population of predators will increase continuously.

The population of predators will increase first and then decrease slowly.

Which category of cells prokaryotic or eukaryotic is your body composed of?

Answers

Answer: HUMAN BODY IS MADE UP OF EUKARYOTIC CELLS.

Bacterial cells are made up of pokaryotic cells. Prokaryotic cells lack true nucleus and cellular membrane bound organelles. The genetic material in a prokaryotic cell is found free in the cytoplasm.
Eukaryotic cells have true nucleus and membrane bound organelles.
Final answer:

The human body is composed of eukaryotic cells, which have a membrane-bound nucleus and differ from the prokaryotic cells of single-celled organisms like bacteria and archaea.

Explanation:

The human body is composed of eukaryotic cells. This places us in the company of animals, plants, fungi, and protists—all of which are also composed of eukaryotic cells. Eukaryotic cells are characterized by having a nucleus that is bound by a membrane, as well as other membrane-bound organelles. In contrast to eukaryotic cells, prokaryotic cells—such as those belonging to the domains Bacteria and Archaea—are generally single-celled organisms without a nucleus.

Biologists differentiate cells into these two categories based on structural and genetic differences. This distinction is important for understanding the complexity of multicellular organisms like ourselves, and also helps in studying the diverse forms of life on Earth. The discovery of the three domains of life (Bacteria, Archaea, and Eukarya) was a significant development in the field of biology, revealing that prokaryotes are more nuanced and diverse than previously thought.

Learn more about Eukaryotic Cells here:

https://brainly.com/question/982048

#SPJ3

What are the structures that are rod shaped and are known as the powerhouses of the cell?

Answers

Answer:  the "mitochondria" .
_________________________________________

In a fish population in a shallow stream, the genotypic frequencies of yellowish-brown fish and greenish-brown fish changed significantly after a flash flood randomly swept away individuals from that stream. this change in genotypic frequency is most likely attributable to:

Answers

Genetic drift.

Genetic drift is when the frequency of a certain allele, in a population, is chosen due to random sampling of organisms. It may alleles to disappear completely and thereby reduce genetic variation. This is way happen in the fish population after the flash flood

The function of mitochondria and chloroplasts is related to energy. In what way does their function differ?

Mitochondria produce energy in prokaryotic cells, while chloroplasts produce energy in eukaryotic cells.

Mitochondria produce energy from food, while chloroplasts produce food from the Sun’s energy.

In plants, mitochondria provide energy in non-green cells, while chloroplasts provide energy to cells in parts of the plant that are green.

Mitochondria provide energy in the night, while chloroplasts provide energy in the day.

Mitochondria provide energy from food synthesized by organelles other than chloroplasts, while chloroplasts provide energy through photosynthesis using the Sun’s energy.

which one would be the answer please help and thank you.

Answers

The Mitochondria gets it energy from food. While the chloroplast get there food from the suns energy through the process of photosynthesis. Chloroplast are also what make the plant leaves green.


Answer: The correct answer is -

Mitochondria produce energy from food, while chloroplasts produce food from the Sun’s energy.

Mitochondria is a specialised membrane bound organelle that is present in the eukaryotes (such as plant and animals) and it is considered as the power house of the cells. It helps in the generation of large amount of energy in the form of ATP (adenosine triphosphate) through cellular respiration (that depicts complete oxidation of food, such as glucose).

Chloroplast is a membrane bound organelle, which is present in the photosynthetic organsisms such as green plants and algae. It is the site for photosynthesis, which is a process of formation of food using sunlight in the presence of carbon dioxide and water.

Thus, second option is the right answer.

During what kinds of processes are atoms and molecules rearranged?
A.chemical
B. physical

Answers

That is a chemical process

atoms and molecules are arranged by physical

What molecule is largely responsible for changes in the volume of a cell?

Answers

It would be water.

Because inside the cell it contains water. Which means the volume of the cell is influenced by the certain amount of water that's in the cell.

The nursing student completes a literature review on​ evidence-based practice​ (ebp). which action indicates that the student understands​ ebp?

Answers

what dose ebp mean first 

A factor of which biotic and abiotic factors whos supply determines the population size of a given species

Answers

O fator é a bioesfera

The flexor hallucis longus muscle originates on the __________.

Answers

This flexor hallucis longus muscle originates on the interosseous membrane which is a fibrous tissue that is between a lot of bones in the body and is an important part of the joints. This tissues can be found in the joints of the arm and also in joints of the legs, among other parts of the body. 

The flexor hallucis longus muscle originates from the deep posterior compartment of the leg, particularly the fibula and interosseous membrane.

The flexor hallucis longus muscle, which is responsible for flexing the big toe, originates from the deep posterior compartment of the leg. Specifically, it arises from the fibula and the lower two-thirds of the posterior surface of the body of the fibula, as well as the interosseous membrane which lies between the tibia and fibula. This muscle plays a critical role in the plantar flexion of the foot at the ankle joint and aids in the stabilization of the plantar arch of the foot during activities like walking.

Which of these bones aligns with the medial, intermediate, and lateral cuneiforms to form the four distal tarsals?

Answers

The bone that aligns with the cuneiforms is the cuboid bone. Together they articulate with the metatarsals of the foot.

The cuboid is the most lateral bone in the distal row. He articulates with the calcaneus posteriorly, and the first and second metatarsals anteriorly.

The three cuneiforms articulate with the navicular  bone posteriorly, and the metatarsals anteriorly.

The navicular bone is the only proximal bone to form a joint or joints with the three cuneiform bones of the foot. The cuneiform bones then go on to form joints with the metatarsals. The cuboid bone is a lateral bone in the foot that only creates a joint with the lateral cuneiform and the fourth and fifth metatarsal bones.

Your patient's urinary output is 50 ml/24 hours, which is essentially no output. how would you document this finding?

Answers

I would document this output as Anuria. It is when your kidneys shut down. It is also called renal failure or kidney failure. If a person isn't peeing, it means that their kidneys aren't working. Organ failure is serious and potentially fatal, and should be treated by transplants and quick medical intervention.

Name two structures are found in a plant cell and not in an animal cell

Answers

Two structures that are found in plant cells but not an animal cells are vacuoles and chloroplasts.

Hope this helps! :)

Multicellular organisms must be protected from the external environment. Because of this, cells of even the simplest multicellular organisms are arranged to form an external barrier of

Answers

Hey there!!




Your answer is epithelial tissue. This tissue is the one that does it part to protect all of the other cells around too or form the external barrier.




Hope this helps!!


Sincerely,

Ans

What abdominopelvic region is the liver in?

Answers

LUQ, Left Upper Quardrant
Final answer:

The liver is primarily located in the right upper quadrant of the abdominopelvic cavity, mainly within the right hypochondriac region and extending into the epigastric region.

Explanation:

The liver is a vital organ located in the upper right part of the abdomen, primarily falling within the right upper quadrant of the abdominopelvic quadrants. It is situated just below the diaphragm, to the right of the stomach, and is protected by the surrounding ribs.

When considering the nine abdominopelvic regions, the liver is primarily in the right hypochondriac region, but it also extends into the epigastric region due to its size and the presence of multiple lobes. The location of the liver is significant for healthcare providers to communicate clearly about abdominal issues, such as the location of pain or the presence of masses.

Survey at least 20 people to find out what traits they have for each of the features below. Tally the numbers for each trait and record those totals in each column.

1. Do you have attached or detached earlobes?

2. Do you have hair present between second and third knuckle of fingers or No hair present between second and third knuckle of fingers?

3. Do you have curly hair or straight hair?

4. Do you have a cleft chin or no cleft chin?

(All help is really wanted! Thanks! :))

Answers

Final answer:

The student's question is about conducting a survey on human genetic traits. As a tutor, I can't perform the survey, but I provided instructions on how to set up the survey, record the data, and analyze the results. The analysis would identify the most common traits in the sample group.

Explanation:

This question relates to human genetic traits and seems to be a task designed as statistical analysis or survey-based research. As a Brainly tutor, I cannot actually perform the survey for you, since this is your school assignment. However, I can provide you a guidance on how to conduct the survey effectively.

To begin with, you should prepare a survey sheet to record the answers for each person you survey. You can create 4 columns with the name of each trait (attached/detached earlobes, hair between knuckles, curly/straight hair, cleft/no cleft chin). Then underneath each column, you should have two rows—one for each possible outcome of the feature (ex. attached or detached). As you survey people, make a tally under the appropriate category. Make sure you ask permission from the people you are surveying, and reassure them that this is for educational purposes only and their information will be kept anonymous.

After you have surveyed at least 20 people, count the tallies in each category and record those totals. These are the results of your survey; the genetic trait that has the most tallies is the most common among your sample group. You can also calculate the percentage of each trait by dividing the number of tallies for that trait by the total number of people you surveyed, and then multiplying by 100.

Learn more about Genetic Traits Survey here:

https://brainly.com/question/32838676

#SPJ12

When cleaning your firearm, why should you avoid dipping a cleaning brush directly into the cleaning solution container?

Answers

In cleaning the firearm, it is best to avoid dipping the cleaning brush directly to the cleaning solution container because if it is directly soaked in the cleaning solution, it will likely cause the supply of cleaning materials or solutions to be contaminated.

Explanation why dipping a cleaning brush into the cleaning solution container when cleaning a firearm should be avoided.

When cleaning your firearm, you should avoid dipping a cleaning brush directly into the cleaning solution container because it can contaminate the entire solution with residue from the firearm.

This contamination can potentially affect the cleaning efficiency and even damage the firearm during the cleaning process.

If excess fertilizer is placed around the root of a tomato plant, the leaves of the plant will shrivel and turn brown. explain this phenomenon in terms of tonicity.

Answers

It is best to mix the fertilizer with the soil so it will be distributed evenly. Placing fertilizer near the root directly is dangerous as the fertilizer concentration will be too high. If the concentration of fertilizer too high, the osmotic pressure or tonicity of the solution will be high. It will attract water of nearby cell and make it shrink. The plant cell will continuously lose water, shrink and then shrivel because of this.
Final answer:

When excess fertilizer is placed around the root of a tomato plant, the tonicity of the solution that the plant cells are bathed in is affected. If the fertilizer solution is hypertonic, the plant cells will lose water through osmosis, causing the leaves to shrivel and turn brown. If the fertilizer solution is hypotonic, water enters the plant cells, causing them to become stiff and turgid.

Explanation:

When excess fertilizer is placed around the root of a tomato plant, the tonicity of the solution that the plant cells are bathed in is affected. If the fertilizer solution is hypertonic, the plant cells will lose water through osmosis, causing the leaves to shrivel and turn brown. This is because the water leaves the plant cells, leading to a loss of turgor pressure needed to keep the leaves and stems upright. On the other hand, if the fertilizer solution is hypotonic, water enters the plant cells, resulting in higher osmotic pressure and turgor pressure, causing the cells to become stiff and turgid.

Learn more about Effects of excess fertilizer on tomato plants here:

https://brainly.com/question/11437413

#SPJ12

Jan noticed that when she put a tomato in water, it sank. When she put an apple in water, it floated. Why did the tomato sink while the apple floated?

Answers

The tomato had a higher density than the water. The apple had a lower density than the water.

What means that the cell membrane allows some, but not all molecules to cross?

Answers

It means that the cell membrane is semi permeable, or u can say differntially permeable, which means it can control what substances to pass in and out.

To maintain turgor pressure, cells in both the leaves and stems of most non-woody or herbaceous plants contain A) chloroplasts. B) starch granules. C) many mitochondria. D) a large central vacuole.

Answers

The correct answer is D) A large central vacuole. Hope this helps.

The correct answer is (d) A large central vacuole.

Plant cell has very large central vacuole that helps in maintaining the turgor pressure of the cell and it also helps in maintaining the stability of plant cell. The maximum amount of water is absorbed in the vacuole and helps to keep the cell erect. In mature plants the vacuole tend to very large and provides mechanical support to the cell. It also helps in waste disposal, protection, growth and storage of plant materials.

True or false? mendel's contribution to genetics was the discovery of dna.

Answers

That statement is false.
Mendel studied inheritance and dominance of traits in the nineteenth century, but DNA itself was discovered by Francis Crick and James Watson in 1953.


Mendel's contribution to genetics was the discovery of alleles which are the different forms of a gene present in an organism and how these genes are transferred from parents to offspring. Thus, the given statement is false.

What is Mendel's law?

Mendel did his experimental work on the garden pea plants (Pisum sativum). He discovered the laws of inheritance. He observed that genes are present in pairs and are inherited as distinct units and one gene is transferred from each parent. He called alleles as dominant and recessive. Dominant alleles show their presence in each generation whereas recessive traits are found to skip generations.

Mendel observed the segregation of genes in a monohybrid cross and the appearance in the offspring as dominant or recessive traits in different generations. He also gave the law of independent assortment of characters where he told that characters are inherited independent of each other in all the generations.

Learn more about Mendel's law here:

https://brainly.com/question/23067535

#SPJ5

Sheela wants to make a computer model of a land ecosystem. Part of her model simulates the chemical processes of photosynthesis that involve the creation of sugars. Which chemical processes are these? A the light-dependent reactions. B the light-independent reactions. C the daylight reactions. D the reactions in the mitochondria.

Answers

The correct answer is option A, that is, the light-dependent reactions.  

The light-dependent reactions are accountable for the generation of glucose molecules, with the use of water and carbon dioxide along with sunlight. In the process, the glucose is dissociated down by the process of respiration, in order to generate ATP in mitochondria.  

The light-dependent reactions utilize light energy to produce two molecules required for the next level of photosynthesis, that is, the energy storing molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions occur in the thylakoid membranes of organelles known as chloroplasts.  


Answer:

The first answer is correct which is, A) The light-dependent reactions

Explanation:

______ tend to have stronger effects of detachment or aggression than alcohol does.

Answers

Class A drugs such as cocaine tend to have stronger effects of detachment due to their tendency to affect mood so strongly and with such pathos. Although alcohol does effect aggression it does not effect it to as such a large degree as Class A like cocaine.

Little help please...? ;-;

Which organelle, that looks like a stack of pancakes, packages and distributes molecules made in the ER?


mitochondria


ribosomes


chloroplasts


Golgi apparatus

Answers

The Golgi Apparatus packages and distributes molecules made in the ER. Hope this helps!

The answer is Golgi apparatus


Genetic drift is _____. hints genetic drift is _____. adaptive more likely to have an impact on small populations an important microevolutionary mechanism in large populations the mechanism by which new alleles originate

Answers

"Genetic drift is more likely to have an impact on small populations."

Genetic drift is changing the frequency in the allelic pool of a population. This phenomenon impacts mainly smaller populations because these populations have only a few copies of the alleles present. If a change in the frequency of the alleles happens then it may cause the disappearance of certain alleles because there are only so many copies.
Final answer:

Genetic drift is an important microevolutionary mechanism in small populations, resulting in random fluctuations in allele frequencies due to chance events.

Explanation:

Genetic drift is an important microevolutionary mechanism in small populations. It refers to the random fluctuations in allele frequencies that occur in small populations due to chance events. Unlike natural selection, genetic drift is not adaptive and can result in the loss of genetic diversity.

Learn more about Genetic drift here:

https://brainly.com/question/31355936

#SPJ6

A patient has been taking fluoxetine (prozac) for 11 months and reports feeling cured of depression. the nurse learns that the patient is sleeping well, participates in usual activities, and feels upbeat and energetic most of the time. the patient's weight has returned to normal. what will the nurse tell this patient?

Answers

that means the medicine is working and to continue to take the medication

What variables(s) influence(s) whether a nonpolar molecule can move across a membrane by passive diffusion?

Answers

Concentration gradient across the membrane. Proteins in the membrane allow specific molecules through, passively. 

Read the description of evolution by natural selection in this section and describe the role that the environment plays in the theory

Answers

Only the successful competitors will reproduce, mortality is very high. Four (4) conditions for natural selection. Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.
Final answer:

The environment plays a pivotal role in evolution by natural selection by determining which traits are advantageous and promoting survival and reproduction of organisms with these traits, thus leading to a diversity of species.

Explanation:

The environment has a crucial role in the theory of evolution by natural selection. Firstly, the environment poses challenges and pressures, such as availability of resources and changing conditions, leading to a struggle for survival known as the 'survival of the fittest'. Organisms with advantageous traits or characteristics, better suited to their environment, have a better chance of surviving and reproducing, passing on these advantageous genes to their offspring.

On the other hand, the environment can also vary and change, meaning what were once considered unfavorable traits can become favorable in the new environment. As such, organisms' genotype and phenotype interact with their environment, and those with the most favorable traits will survive and reproduce more.

Therefore, the environment plays an influential role in the entire process, determining which traits are advantageous and leading to a biodiversity of species through the mechanism of natural selection.

Learn more about evolution by natural selection here:

https://brainly.com/question/4075522

#SPJ3

A glucose molecule could be used as an example of potential energy, why is this true? The chemical energy stored in the glucose molecule is available to do work The light energy is stored in the glucose molecule The glucose molecule is actively involved in energy production The glucose molecule participates in all cell activities

Answers

Since glucose really means "sugar", Sugar gives us energy and is also a necesity that our body needs to keep up.

Ans. 'The chemical energy stored in the glucose molecule is available to do work.'

Glucose molecule is considered as primary fuel of the body as it provides energy for all cellular activities.

All organisms generate energy by breakdown of glucose molecules through the process of cellular respiration, in which chemical energy of glucose is converted ATP molecules. The ATP molecules release energy during hydrolysis and provide energy to do work. Hence, glucose can be used as an example of potential energy.

Other Questions
need help with some questions please Why would life be impossible without enzymes? Karyn is a second-year college student. the job market in her field has not been very good in recent years, and she is very concerned about being able to find a job after graduation. she thinks a lot about the job market and what she can do to compete effectively in it, and plans her coursework around that. karyn is experiencing ________ about the job market. Why did virginia replace indentured servants with african slaves? What is the equation of a line that passes through the point (8, 2) and is parallel to the line whose equation is 3x + 4y = 15? Enter your answer in the box Im stuck on 5-6. Please help if you could explain the answer also that would be awesome look at the triangle what is the value of tan x? Use a trigonometric ratio to find the length of side ST. Why did Great Britain pass the sugar act , the stamp act , and the townshend acts What is the name of the continental plate that is involved with the andes mountains? When it becomes necessary to enlist the fight-or-flight response, a hormone that is released during the alarm phase of the general adaptation syndrome is? which example characterizes enterohepatic circulation? how many tenths are in 4/5 The amendment to the u.s. constitution that prohibited the states from denying the vote due to race was the How are galaxies organized and distributed within the universe What was a result of investors selling stocks at much lower prices than they bought them, ultimately contributing to the stock market crash?A) People who normally did not invest began buying stocks because they were so cheap. B) Businesses had to buy back their own stocks so investors would not sell them too cheaply. C) Investors who borrowed could not pay back their loans, so people rushed banks to withdraw their savings. D) The investors made a large profit upfront because they were able to sell so quickly; however, they were unable to buy the stocks back. Greek god question for 50pts I need a one paragraph summary on Hephaestus for an art assignment just the general mythos About 50 years ago,the Yankees' Mickey Mantle was one of baseball's great sluggers.He is credited with hitting the longest homerun ever.It traveled a distance of 643 feet.How many kilometers did the ball travel,rounded to the nearest hundredth?Pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee someone it will mean a lot btw this is middle school. When the demand curve shifts to the left, what is this called? If three times the smaller of two consecutive integers is added to four times the larger, the result is 67. Find the smaller integer. Steam Workshop Downloader