scientists MUST test the hypothesis several times and if they keep getting the same results, it is now considered a theory.
21. Which of the following is not a feature of echinoderms? tube feet body segments radial symmetry endoskeleton
Answer:
Explanation:
body segements
Answer:
Option). segments.
Explanation:
Echinoderms are marine organisms that belong to phylum Echinodermata. These organisms are characterized by tube free (tentacle-like structures), radial symmetry, and endoskeleton, which is made up of calcium carbonate.
Echinoderms have non-segmented bodies, means they are asegmented organisms.
Thus, the correct answer is 'segments.'
For biology, what is considered to be beautiful. How do people comprehend in there mind that certain people are and aren’t beautiful? What is the standard of beauty?
It’s something related to the person about what he want and prefer
So everyone having his own opinion so some people can see thing beautiful while other didn’t like it.
Good luck,!
Beauty is influenced by evolutionary, psychological, and cultural factors. While traits like symmetry are universally considered attractive due to their biological significance, personal and cultural experiences greatly shape individual perceptions of beauty.
In science, what we view as lovely frequently has establishes in transformative and mental elements. Natural hypotheses propose that specific characteristics are found appealing in light of the fact that they are signs of wellbeing and great hereditary qualities.
For instance, evenness in facial elements is many times seen as a marker of hereditary solidness, which can be a sign of good wellbeing and fruitfulness. In any case, the idea of excellence isn't exclusively organic; it is likewise impacted by social standards and individual encounters.
As the colloquialism goes, 'attractiveness is entirely subjective viewer', which features that impression of magnificence are abstract and can change extraordinarily among people and across various societies.
All in all, magnificence is a perplexing transaction of organic, mental, and social variables. It incorporates general qualities like balance and wellbeing markers, however it is additionally molded by social qualities and individual emotional encounters.
Two students are comparing scientific experiments to investigations. They came up with the following ideas.
Student A: Testing plant growth in different types of soils
Student B: Comparing the water level in a lake during different times of the year
Which student gave an example of a scientific experiment?
A.Student A because it requires experimental and control groups
B.Student B because it requires a hypothesis
C.Student A because it is preferably done in natural settings
D.Student B because it is preferably done across a long period of time
Answer: Student A
Explanation: student a because it requires experimental and control groups.
Answer:
A. Student A because it requires experimental and control groups
Explanation:
a control group is a group of materials you are testing and switch out to see a better benifit.in this case the soil types.
A liver cell requires energy to move vitamins from an area of low concentration,across the cell membrane,to an area of high concentration. This process used by the liver cell is called
Answer:
Active Transport
Explanation:
Active transport is the process of transport of substances from region of their lower to that of higher concentration. Since the transport occurs against the concentration gradient, it is energy requiring process and needs input of energy to occur.
In given example, liver cells transports vitamins against the concentration gradient in energy dependent manner. Therefore, it is an example of "active transport".
For numbers 1 to 10, if a cell has a diploid number of 24, how many of the structures will be present at each stage indicated?
CHOICES: A). 0 B). 12 C). 24 D). 48
1. Centromeres at Anaphase
2. Chromosomes at Prophase 1
3. Chromatids at Telophase
4. Centromeres at Metaphase 1
5. Chromosomes at the end of Telophase 1
6. Chromatids at Anaphase 2
7. Chromosomes at Metaphase 2
8. Chromosomes in organism's sperm cell
9. Centromeres at Anaphase 1
10. Chromatids at Anaphase
Final answer:
For a diploid number of 24, the number of structures present at each stage indicated varies from 0 to 48.
Explanation:
For a cell with a diploid number of 24, the number of structures present at each stage indicated are as follows:
Centromeres at Anaphase: There will be 0 centromeres.
Chromosomes at Prophase 1: There will be 24 chromosomes.
Chromatids at Telophase: There will be 48 chromatids.
Centromeres at Metaphase 1: There will be 24 centromeres.
Chromosomes at the end of Telophase 1: There will be 48 chromosomes.
Chromatids at Anaphase 2: There will be 48 chromatids.
Chromosomes at Metaphase 2: There will be 24 chromosomes.
Chromosomes in organism's sperm cell: There will be 24 chromosomes.
Centromeres at Anaphase 1: There will be 24 centromeres.
Chromatids at Anaphase: There will be 48 chromatids.
Option A)0 is the correct answer for: 1.Centromeres at Anaphase,
Option B)12 is the correct answer for: 5.Chromosomes at the end of Telophase, 7.Chromosomes at Metaphase2, 8.Chromosomes in organism's sperm cell
Option C)24 is the correct answer for 2.Chromosomes at Prophase , 3.Chromatids at Telophase, 4.Centromeres at Metaphase , 6. Chromatids at Anaphase, 9.Centromeres at Anaphase
Option D)48 is the correct answer for 10.Chromatids at Anaphase
Centromeres at Anaphase:) 0.An ocean food chain is shown. Which organism is a tertiary consumer? a.clownfish b.brittle star c.killer whale d.octopus
please help me I'm confused!!!!
The answer is C. Killer Whale. A tertiary consumer eats secondary consumers and is usually a carnivore, though some can and will eat plants.
A person who recives the same version of a gene from each parent is said to be. For that gene
Answer:
A person who receives the same version of a gene from each parent is said to be homozygous for that gene.
Explanation:
Based on gene pairs two terms are used to describe the gene variation. Homozygous gene are those who have identical alleles and result in same phenotype. While heterozygous genes have different alleles for the same gene and results in a mixed phenotype that depends on dominant trait. In the given example if a person receives same genes from parents he will be called homozygous for that gene.
Answer: chromosome above guy is wrong
Explanation:
Why are the seasons opposite in the northern and Southern Hemispheres
Answer:
throughout the year, the earth tilts. This causes the north pole to be the closest to the sun half the year and the south pole to be the closest to the sun the other half.
Explanation:
Great question!
That is because they are on opposite sides of our planet. If one side is illuminated, then the other side must be shadowed. So the Earth alternates between
Northern hemisphere tilted toward the Sun, southern hemisphere tilted away from the Sun
and
Northern hemisphere tilted away from the Sun, southern hemisphere tilted toward the Sun
Which of the following is true about the age of rock layers and the age of the Earth?
Answer:
Likewise, scientists use radiometric dating to determine the ages of moon rocks, obtained by astronauts. Taken together, these methods give results that suggest an age for our Earth, meteorites, the moon – and by inference our entire solar system – of 4.5 to 4.6 billion years old.
Explanation:
Answer:
The Earth is older than any rock layer.
Explanation:
Answered it correctly on Study Island C:
Which point in this graph shows the beginning of a period of exponential
growth?
A. Point D
B. Point
C. Point A
D. Point B
Answer: Point A
Since it says the "beginning" of an exponential growth period, I guess Point A would be the beginning.
Point B is during, and Point C is after and Point D looks like it is at carrying capacity.
Answer:
Point A
Explanation:
The s shape curve beginning represents the point A. The point A in the graph shows the beginning of a period of exponential growth.
The Point B is near to point A whereas point c is after point B. The point D represents the carrying capacity. The carrying capacity is the maximum size of population that can be sustained by environment. Thus, the point A is representing exponential growth beginning.
Please Help... i been sitting here trying to figure this out.
Answer:
A
Explanation:
Answer:
I believe the answer is A.
Explanation:
Hope this helps!
A _______ is a speleothem that forms on the ceiling of a cavern and resembles an icicle made of rock.
A. limestone
B. stalagmite
C. flowstone
D. stalactite
A stalactite is a speleothem that forms on the ceiling of a cavern and resembles an icicle made of rock.
Stalactite is a deposit of us usually calcium and carbonate that forms icicles that hang on the cave ceilings and formed by the dripping of water.
A stalactite is a speleothem that forms on the ceiling of a cavern and resembles an icicle made of rock.
What is stalactite?Stalactites generally grow down from the cave ceiling, while stalagmites grow up from the cave floor. It's easy to remember which is which: Stalactites have a "T" for top and stalagmites have a "G" for ground.Stalagmites are commonly composed of calcium carbonate but may consist of lava, mud, peat, pitch, sand, sinter, and amberat.All limestone stalactites start with a single mineral-laden drop of water. When the drop of water falls, it deposits the thinnest ring of calcite. Each subsequent drop of water that forms and falls deposits another calcite ring.To learn more about stalactite refer to:
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Which will cause a decrease in gas pressure in a closed container?
A reducing the volume
B adding more gas
c lowering the temperature
Answer:
C
Explanation:
Reducing more volume will mean that the density of gas is higher and therefore it would be at higher pressure. Adding more gas would have the same effect.
Lowering the temperature would mean that the molecules would be moving slower and therefore decreasing pressure
Which organism in this food web is an omnivore?
boa constrictor
beetle
coati
poison dart frog
sloth
strangler fig
fungus
A. Sloth
B. Boa constrictor
C. Coati
D. Fruit bat
E. Strangler fig
The answer would be C
Explanation: The coati eats a variety of different fruits, nuts and seeds, along with insects, birds eggs, rodents and small reptiles such as lizards and snakes.
The organism coati in this food web is an omnivore. Thus, option C is correct.
What is Food Web?A food web is defined as the natural interconnection of food chains and is a graphical representation of what-eats in an ecological community. Food web is also known as consumer-resource system.
A food web consists of many food chains while a food chain follows only one path as animals find food. For example, Falcon eats snake, which has eaten frog, which has eaten grasshopper, which has eaten grass. Thi shows the many different pathways that plants and animals are connected.
In this, the lower trophic level organisms have more energy than the upper trophic level because only 10% of the energy flows from one trophic level to the next. In the above case, beetles have the highest energy compared to other organisms.
Thus, Beetle in the food web below is likely to store the most energy. So, the correct option is (C).
Learn more about Food Web, here:
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What happens when an electrical gradient and a chemical gradient are applying opposite forces to active transport?
Answer:
In a cell, there are two kinds of gradients found, that is, chemical and electrical. The electrical gradient is produced by the net charge of negative and positive charges found across the membrane. The chemical gradient is produced by the concentration of ions across the membrane. In combination, it is called the electrochemical gradient, which in general function in reverse directions.
The procedure where pumping of ions takes place across the membrane via ion pumps against the electrochemical gradient is known as the active transport. This mode of transport sustains the balance of ions across the membranes and is dependent upon energy. The ATP is provided by the metabolic activities of the cell.
Answer:
They negate each other.
Explanation:
The combined effects of electrical and chemical gradients lead to the formation of an electrochemical gradient. This simply means that both an electrical gradient and a chemical gradient can have an effect on the movement of substances, and that their effects may combine (the chemical and electrical gradients encourage movement in the same direction), or they may negate (one gradient opposes another).
#pennfoster
Hope this Helps!! Thanks so much! (✿◠‿◠)
Which is a difference between bacteria and viruses that shows that bacteria are living organisms viruses are not
Answer:
Only bacteria reproduce asexually, Viruses reproduce by attaching to a host cell.
Answer:
Only bacteria can reproduce outside a host.
Explanation:
A P E X
what does natural selection have to do with evoultion
Answer:
Explanation: They are not the same. Natural selection allows evolution to occur over time.
Beth’s mothers uses cloth bags to carry her groceries home from the grocery store. How does using cloth bags instead of paper bags help the environment?
A) there is more trash
B) more trees are cut down
C) fewer trees are cut down
D) more paper bags are made
Answer:
C)fewer trees are cut down
Explanation:
The cloth is not made of trees while the paper bags are
The dissolved oxygen in a reservoir was monitored for one year. Based on this data, what might greatly reduce the available dissolved oxygen in an aquatic habitat?
A) thermal pollution
B) fertilizer run-off
C) increased water turbidity
D) decrease in pH due to acid rain
Answer:
I would say A
Explanation:
Judging from the graph, you can tell that the dissolved oxygen line (the black one) is lowest during July and some parts of September ( or between those two). At the same time, you can see the blue line - for water temparature - is highest; which means that an increase in temperature ( or thermal energy) results in lower dissolved oxygen. The only answer choice that relates to higher temperatures is A, thermal pollution which is just a result of companies or people using natural bodies of water for industrial purposes.
How can new technology and experimental methods can lead to changes in theories
Answer:
When you research your theory, you can find out new information that may change your opinion on your theory. When technology and experimental methods are used, theories can be either proven or unproven, therefore changing the writers ideas and opinions.
What would you need to do to find an object’s mass and velocity? What tools would you use?
The climate zones lying between 23.5° and 66.5° north and south latitude are called the _____ zones.
tropical
temperate
subtropical
polar
Answer:
they are the temperate zones
Explanation:
if cells were placed in a solution, and you observed them shrinking, the solution is probably _____
It is a hypertonic solution:)
Answer:
Hypertonic solution.
Explanation:
if cells were placed in a solution, and you observed them shrinking, the solution is probably a hypertonic solution.
Hypertonic solution refers to a solution that has a greater concentration of solutes on the outer membrane as compared to the inside of the cell.
Which important indoor safety measure should be taken during a thunderstorm?
Lie on the floor.
Cover your head.
Go to the basement.
Move away from windows.
Answer:
Move away from windows
Explanation:
I took the testttttt :o
When there is a thunderstorm, the following important indoor safety measure should be taken: move away from windows. The correct option is D.
What are the safety measures during thunderstorm?During a thunderstorm, lightning can strike a house and travel through the electrical wiring and metal pipes, which can pose a serious hazard to people inside the house. Therefore, it is important to stay away from windows and avoid any contact with metal objects in the house that can conduct electricity.
In addition, it is recommended to avoid using electronics, taking a bath or shower, and talking on a corded phone during a thunderstorm. If possible, it is also a good idea to unplug electronic devices to protect them from power surges that can occur during a storm.
If a person is caught outside during a thunderstorm, they should seek shelter in a sturdy building or vehicle and avoid standing under tall trees or other tall objects.
Therefore, the correct option is D.
Learn more about Thunderstorm here:
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(Will mark brainliest, direct answer is preferred)
Which sequence shows the correct path of blood flow between the heart and lungs?
right ventricle, lungs, left atrium
right atrium, lungs, right ventricle
left atrium, lungs, left ventricle
left ventricle, lungs, right atrium
Answer:
Right ventricle, lungs, left atrium
Explanation:
The pathway of blood in the heart and lungs follows this order:
The body -> Superior and inferior vena cava -> Right atrium -> tricuspid valve-> right ventricle-> pulmonary semilunar valve -> pulmonary artery -> lungs-> pulmonary vein -> left atrium-> bicuspid valve -> left ventricle- aortic valve-> Aorta-> the body
So not counting the valves and the vessels, the best answer would be the first option.
It would also be good to remember that unoxygenated blood starts in the right side of the heart and the oxygenated blood starts in the left side of the heart.
Ventricles pump blood and atria receives blood. The right atrium receives blood from the lungs, while the left atrium receives blood from the body. The left ventricle pumps blood towards the body, while the right ventricle pumps blood towards the lungs.
Population control factors whose effects increase as the size of the population increases are
Answer: Density -dependent factors.
Explanation:Density is defined as the mass of an object divided by its volume. Density can be used as a conversion factor between mass and volume.
Density-dependent factors are population control elements whose effects increase with population size, such as food scarcity and disease spread. Density-independent factors affect populations regardless of size, like natural disasters. Conservation biologists study these to manage populations sustainably.
Explanation:Population control factors whose effects increase as the size of the population increases are known as density-dependent factors. These factors include competition for resources like food and space, predation, disease, and stress from overcrowding, which can all lead to higher mortality rates or lower birth rates as the population density rises. In contrast, density-independent factors affect populations regardless of their size and include events such as natural disasters or climate changes.
The effect of density-dependent factors is more pronounced in larger populations; as the population grows, these factors can serve as limiting elements to slow down or decrease the population size. For example, with the human population's continuous growth, increased competition for finite resources such as food, clean water, and livable space becomes more significant. Such scarcity can result in social issues like malnourishment, spread of infectious diseases, and conflict.
Understanding these factors is crucial for conservation biologists and wildlife managers to prevent extinction or overpopulation and to manage population growth sustainably. Particularly for humans, other considerations like migration, public health advancements, and changes in lifestyle due to technological developments also play significant roles in population dynamics.
In what type of relationship do fig trees and fig wasps engage
Answer: Symbiotic Relationship
Both fig trees and fig wasps are important for each others survival.
Explanation: The fig provides a joke for the wasps and the wasps provide pollen that the fig needs for the fruit to ripen.
It basically begins when a female fig wasp enters the fig and lays eggs ,they pollinate the fig with pollen that they had collected in their pouches after mating ,when the wasp enters the fig its wings and parts of antennae may get broken because of the small opening in the fruit ,the wasp completes it's task and never leave the fruit after.
Fig trees and fig wasps have a mutualistic symbiotic relationship, where both species benefit from the interaction, with the wasps pollinating the trees while also laying their eggs, continuing their lifecycle.
Figs and fig wasps engage in a form of symbiotic relationship known as mutualism. In this relationship, both the fig tree and the fig wasp benefit from their interaction. The female fig wasp enters the syconium, or the inside-out inflorescence of the fig, where her wings are torn off, and she deposits her eggs. Through this process, she also inadvertently pollinates the fig's flowers using the pollen she carries from another fig tree. This results in the production of seeds for the fig tree and creates a nursery for the next generation of wasps. Eventually, the fig wasp offspring will hatch, with females collecting pollen before leaving to find a new fig to continue the cycle.
The relationship between figs and fig wasps is intricate and vital for the survival of both species. While some flowers are pollinated and develop into fig fruit, others serve as a development ground for new fig wasps. It is a highly specialized form of mutualism, with each species being indispensable to the other's lifecycle.
To contrast this relationship with another type, the text describes the southern masked-weaver bird nesting in a tree as commensalism, where the bird benefits and the tree is neither harmed nor benefited. This illustrates the diversity of species interactions in nature, ranging from mutualistic to commensal relationships.
Drag the labels to the correct location on the image. Each label can be used more than once.
Identify what happens to light in this model of the greenhouse effect.
Answer:
The greenhouse effect is a natural process which increases the temperature of the Earth. The greenhouse effect is caused by the absorption by the surface of the Earth and re-absorption by the atmosphere of the greenhouse gases (CH₄, CO₂, NO, CFCs ) in the environment.
This is caused when solar radiation reaches Earth- some of the energy is absorbed by the land and water while the rest of the energy is reflected back into space. Now the absorbed heat radiate from earths surface is trapped by the greenhouse gases in the atmosphere which causes the warming of the Earth. But due to the increase in greenhouse gases extra heat is absorbed which leads to Global warming.
Thus, marked options in the box are correct.
Mafic lava tends to have low silica content. Based on this, which of the following statements about mafic lava is most likely true?
A. It contains fewer volatile gases.
B. It has higher viscosity.
C. It flows slowly.
D. It contains more volatile gases.
Answer:
A. It contains fewer volatile gases.
Explanation:
Mafic lava have a composition of about 45-55% silica with high amount of Fe, Mg, Ca.
The silica content is quite low compared to those of granitic magma whose silica content can reach up to about 60%.
What determines the viscosity of magma is basically the silica content of the magma and the temperature of the magma. Viscosity is the resistance to flow.
The higher the silica content, the lower the viscosity and the higher the amount of volatile gases. Such type of magma is the granitic magma. Granitic magma due to their viscosity flows slowly.
The lower the silica content, the higher the viscosity and the lesser the presence of volatile gases in them. Such an example is Mafic magma. Mafic magma flows very slowly with low amount of dissolved gases.
Answer:
A. It contains fewer volatile gases
Explanation:
The mafic lava is a lava type that has low viscosity. The reason for that is its composition, being very rich in magnesium and iron. Because this type of lava is low in viscosity, it is unable to contain the majority of the gases and water in it, as they find it relatively easy to ''escape'' from it. That results in much calmer eruptions of the volcanoes that produce mafic magma, with explosions almost never occurring, and even if they do they are very small.
When rock is weathered and transported downstream, this is best seen as an
example of the conservation of
Answer:
Matter
Explanation:
Matter
Answer:
matter
Explanation:
Matter can neither be created nor destroyed. When a rock is weathered, even though it is broken into smaller particles, they all still exist . If these particles, no matter how minuscule, are combined again they would lead to the formation of same rock. Hence conservation of matter is followed here since rock is a type of matter.