The correct answer is - A) They ensure that the ecosystem is not stripped entirely of its vegetation.
The ecological pole of the predators is to maintain the balance between the herbivores and the vegetation. By being able to kill and eat large numbers of herbivores, the predators do not allow their numbers to grow over what is an optimum for the survival of the ecosystem.
If there's no predators, for only a very short time, the numbers of herbivores will grow significantly, to the point where pretty much all of the vegetation will be stripped, thus ending without food and dying out very quickly, as well as damaging almost all vegetation and contributing to its dying out.
Predators ensure the transfer of energy from plants to the rest of the food web. Therefore, the correct option is B.
By controlling the population of their prey species, predators play an important role in maintaining the balance of the ecosystem. To keep herbivore populations under control and avoid overgrazing or excessive plant consumption, predators eat them. As a result plant populations can grow and regenerate permanently.
Predators also aid in the movement of energy through the food chain. They eat herbivores, and plants are a source of energy for herbivorous animals. As we move up the trophic levels, this energy is transferred from plants to herbivores to carnivores. Predators control herbivore populations by ensuring that energy is effectively channeled and dispersed throughout the ecosystem.
Therefore, the correct option is B.
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which of the following best illustrates the role that gravity played in the in the formation of the solar system? (A) gravity removed excess gas and dust from the cores of the planet (B) gravity pulled particles of dust and gas together to form planes (C) gravity caused the nebula to cool enough for planets to form (D) gravity allowed the nebula to expand and move outward
Answer:
(B): Gravity pulled particles of dust and gas together to form planets.
Explanation:
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Answer:
Option B. Gravity pulled particles of dust and gases together to form planets.
Explanation:
The definition of gravity in relation to astronomy can be compiled as the force by which planets and other heavenly bodies attract objects towards its center.Our solar system was formed 4.5 billion years ago due to a stellar explosion called supernova which scattered gases and dust into space.Some of the bodies with a larger mass and potential gravitational pull must have attracted particles, dust, material, and gases to form planets with an atmosphere revolving around the central star i.e., Sun.For more information:
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How does natural selection support the theory of evolution?
a) Natural selection explains how the changes in life forms that evolve over millions of years take place over shorter periods of time.
b) Natural selection explains how certain life forms are able to survive and reproduce after changes in their environmental conditions.
c) Natural selection comes from the collection of fossil record data that shows how life forms.
DNA is coiled into chromosomes in a cells
The right answer is in a cell's nucleus.
The nucleus contains the DNA (deoxyribonucleic acid) on which is encrypted the genetic information: the chromosomes.
When the cell is not in a fission period, the DNA is pelletized and the chromosomes can not be seen. On the other hand, as soon as it enters the period of fission, the DNA unfolds and the chromosomes are clearly visible in batonets, so that they can be doubled.
Desert plants are characterized by
Occasionally asexual reproduction can cause undesirable proliferation of an organism.
True
False
Answer: True
Asexual reproduction is a process in which single parent organism produces offsprings. This occur in simple organisms like bacteria, prokaryotes and fungi where a single cell breaks down into two or more numbers of daughter cells. The asexually reproduction can cause undersirable proliferation because the environment will not be able to sustain such a undesirable increase in number of offsprings and ultimately offsprings will die.
Which is the first step in the scientific method
What is the purpose of the biogeochemical cycles?
A.to cycle energy through a food chain
B.to recycle matter through the biosphere
C.to recycle rocks through the layers of Earth
D.to cycle nutrients through the human body
In a dihybrid cross, the F2 will have nine genotypes, but only four phenotypes because the (Homozygous, Heterozygous) genes cause the (Recessive, Dominant) traits to mask the (Dominant, Recessive) traits.
SOS:
The answers is:
In a dihybrid cross, the F2 will have nine genotypes, but only four phenotypes because the Heterozygous genes cause the Dominant traits to mask the Recessive traits.
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Answer
heterozygus, dominant , ressesive traits
Explanation:
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Over the last several decades, the scientific community has gathered a large amount of information regarding genetics and genetic variation. What are two main sources that lead to increased genetic variation?(((((Both answers must be selected.))))) A) Selective breeding, B) Gamete mutations, C) Recombination, D) Genetic drift
Answer:
B) Gamete mutations, C) Recombination
Explanation:
Any random changes in the DNA of gametes are called as gamete mutations. These mutations are transmitted to the next generation via gametes and thereby the genetic variations are increased.
Recombination is the production of new gene combinations. Crossing over during meiosis I of gamete formation add new gene combinations to gametes. Random fertilization of these gametes add even more genetic variations to the progeny.
Organisms at the bottom of the pyramid produce enough usable chemical energy to support the entire ecosystem through
A) predation.
B) photosynthesis.
C) cell respiration.
D) anaerobic respiration.
Answer: The correct answer is -
B) photosynthesis
Explanation:
Photosynthesis can be described as process of creating food (in the form of glucose) in green plants, algae, and some protist (that are called producers). It uses inorganic molecules that are carbon dioxide and water in the presence of energy from sunlight to synthesise glucose and release oxygen as waste in surroundings.
It takes place in the specialized membrane bound organelles, called chloroplast.
Producers occupy the base of any food chain, which can be represented by energy pyramid, thus they produce enough chemical energy to support the entire ecosystem through photosynthesis.
how does a cell react in salt water
1.
Which of the following is true about ice sheets?
They are the smallest type of glacier.
They flow in all directions.
They usually flow down valleys.
They are found only in high mountain areas.
2.
The Antarctic Ice Sheet in the Southern Hemisphere ____.
is the only true ice sheet that remains on the planet
holds almost one-half of Earth’s salt water
holds almost two-thirds of Earth’s fresh water
contains about one-fourth of the world’s ice
3.
A thick ice mass that forms over the land from the accumulation, compaction, and recrys1.
Which of the following is true about ice sheets?
They are the smallest type of glacier.
They flow in all directions.
They usually flow down valleys.
They are found only in high mountain areas.
2.
The Antarctic Ice Sheet in the Southern Hemisphere ____.
is the only true ice sheet that remains on the planet
holds almost one-half of Earth’s salt water
holds almost two-thirds of Earth’s fresh water
contains about one-fourth of the world’s ice
3.
A thick ice mass that forms over the land from the accumulation, compaction, and recrys ...?
Can a dead cell carry out diffusion and active transport?
No, a dead cell cannot carry out active transport as it requires ATP, which dead cells do not produce. Diffusion may continue passively for some time, but active processes cease with cell death.
Can a dead cell carry out diffusion and active transport? No, a dead cell cannot carry out active transport because active transport requires energy, which is usually obtained from ATP. Living cells use metabolic energy to maintain concentration gradients of ions and other substances across their membranes. This energy is particularly crucial for active transport processes such as the Na+-K+ ATPase pumps in red blood cells, which maintain the imbalance of sodium and potassium ions across the cell membrane. Once a cell dies, it ceases to produce ATP, thus halting active transport mechanisms. While diffusion is a passive process that might continue for a time after a cell perishes due to existing concentration gradients, without ATP, the active transport processes cannot occur in a dead cell.
Which element in the southwestern desert ecosystem is abiotic?
Abiotic being non-living or sterile could cover a lot of elements in a desert ecosystem. Rocks, water, air to name a few.
Is cooking an egg endothermic or exothermic chemical reaction?
Answer:
1:endo
2:exo
3:exo
4:neither
Explanation:
If a person with o blood type produces offspring with a person with b blood type, then what percentage of their offspring will be type o in the best case scenario?
Answer:
In humans, blood group is determined by three alleles [tex]I^{A}[/tex], [tex]I^{B}[/tex], and [tex]i[/tex].
[tex]I^{A}[/tex] and [tex]I^{B}[/tex] are co-dominant whereas [tex]i[/tex] is recessive to other two.
Thus, if a person with blood group O produces offspring with blood group B then the other parent must contain [tex]I^{B}[/tex] allele.
The genotype of other person can be [tex]I^{A}I^{B}[/tex], [tex]I^{B}I^{B}[/tex], or [tex]I^{B}i[/tex].
There is only one condition in which the person can have offspring with blood group O that is, when the other parent is [tex]I^{B}i[/tex].
In this condition, the probability of an offspring to have blood group O is 50%.
In other conditions, the probability of an offspring to have blood O is 0%.
In the best case scenario where the type B parent is heterozygous (BO), there is a 50% probability that the offspring produced with a type O blood person (ii) will have type O blood. If the type B parent is homozygous (BB), all offspring would be type B with no possibility of having type O blood.
Explanation:Offspring Blood Type ProbabilityWhen a person with type O blood (genotype ii) produces offspring with a person with type B blood, the offspring's blood type depends on the genotype of the type B parent. Provided the type B parent is heterozygous (genotype BO), which is the best case scenario for offspring to have type O blood, the possible genotype combinations would be Bi and iO.
The offspring would have a 50% chance of inheriting the O allele from the type O parent (genotype ii) and the O allele from the type B parent (BO), resulting in a genotype of type O (ii) for the offspring. Consequently, the offspring would have a 50% probability of having type O blood.
If, however, the type B parent is homozygous (BB), then all offspring would inherit one B allele and would not have the chance of being type O. Thus, they would all be type B.
What are microwaves are used for?
A. cell phone transmitters and cooking food
B. T.V. signals
C. visible light
What is an important function of the mitochondria?
Explanation:
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Mitochondria with organelles present in eukaryotic cells. In them, cellular respiration occurs, a process by which carbon dioxide is converted into oxygen. In addition, the Krebs cycle that is part of cellular respiration occurs.
In plant, algae, fungi, and most bacteria cells, there is a rigid layer that surrounds the cell membrane and gives protection, support, and shape to the cell. what is this layer called?
a. cell wall
b. cytoplasm
c. chloroplast
d. plasma membrane
Which of the following is true about unicellular organisms?? URGENT
A they often have specialized cells
B they are made up of one cell
C they lack organelles
D they are all plants
The correct answer is B, unicellular organisms are made up of one cell. They can have complex structures and functions, but they do not have specialized cells, are not all plants, and do not lack organelles.
The subject at hand is unicellular organisms. When considering unicellular organisms, the following statement is true: they are made up of one cell. Therefore, the correct answer to the question is B - they are made up of one cell. Unicellular organisms may have complex internal structures and can perform all the life functions within that single cell. They may have organelles and specialized structures, such as flagella for movement. However, unicellular organisms do not have specialized cells since each organism is comprised of a single cell. They are not all plants but can be found across various classifications such as bacteria, protozoa, and some algae.
Explain the interaction between the central nervous system and the peripheral nervous system.
The crucial regulatory, controlling and communicating system of the body is called the nervous system. It has an important role in acquiring and giving responses to a stimulant.
How do Central nervous system and PNS interact?The central nervous system comprises of the brain and spinal cord while the PNS have nerves spread throughout the body parts.The PNS connects the central to the body tissues, organs and skin structures with the help of nerves. The central nervous system receives information from the PNS via the nerves and helps in transmitting the response to the action received.Therefore, PNS and central nervous system are interrelated to each other for functioning.
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What conducts electric current in solutions?
elements
electrolytes
atoms
molecules
Answer:
Electrolytes
Explanation:
An electrolyte is a substance that conducts electricity when dissolved in a polar solution e.g water. They are particles that carry a positive or negative electric charge called Cations and Anions respectively.
Electrolyte can also be referred to as a substance that dissociates into ions in solution and acquires the capacity to conduct electric currents. It becomes an ionic conductor when fused or dissolved in a suitable solvent.
Electrolytes include Sodium, pottasium, calcium, bicarbonate and magnesium amongst other body minerals. These minerals carry a small electric charge in fluid environment.
Electrolytes conducts electric current in solutions. Therefore, the correct option is option B.
In order for our bodies to function properly, electrolytes are necessary, and realising this can do a lot for our general health. They are minerals that, when dissolved in water, take on an electrical charge and are necessary for a number of physiological activities. Sodium is one of the most well-known electrolytes. It is essential for maintaining the equilibrium of bodily fluids, neuron activity, and muscular contraction. Sodium influences how much water the body retains, which influences blood pressure. However, consuming too much sodium can result in health problems like high blood pressure and fluid retention.
Therefore, the correct option is option B.
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Which of the following is not a contributing factor to the declining Atlantic cod population?
A.) Destruction of marine habitats
B.) Increasingly efficient fish-harvesting technologies
C.) International treaties reducing competition among fishing fleets
D.) Decreases in ocean temperatures
Why is it important for the cells of multicellular organisms to undergo mitosis?
How to separate genomic DNA and plasmid?
...?
Biogeochemical cycles recycle water and natural elements throughout the biosphere to ensure that organisms do not run out of these substances. Thiobacillus denitrificans is a specialized species of bacteria that obtains its energy from carbon dioxide and inorganic compounds such as nitrogen in its environment. It is used in bioremediation of groundwater that contains excess nitrate. How does Thiobacillus denitrificans help bioremediate groundwater? nitrification denitrification nitrogen fixation decomposition
Final answer:
Thiobacillus denitrificans helps in the bioremediation of groundwater by performing denitrification, converting excess nitrates into nitrogen gas and reducing nitrate pollution.
Explanation:
Thiobacillus denitrificans plays a crucial role in the biogeochemical cycles by performing denitrification. This specialized species of bacteria helps in bioremediating groundwater by converting excess nitrates (NO₃⁻) into nitrogen gas (N₂), effectively reducing nitrate pollution. Denitrification is an essential process in the nitrogen cycle as it prevents the accumulation of nitrates which can lead to eutrophication of aquatic systems and groundwater contamination. Denitrification by Thiobacillus denitrificans demonstrates the beneficial application of bacteria in removing pollutants from the environment, supporting sustainable agriculture and ecosystems.
Cells function together to form tissues. The four main types of tissues in animals are _____.
epithelial
blood
connective
muscular
nervous
bone
Which of the following best describes the solar radiation absorbed by and radiated from earth?
a. Most incoming solar energy is absorbed by the atmosphere.
b. Only a small fraction of energy radiating from Earth is from the atmosphere.
c. The Earth’s surface is responsible for a small fraction of heat radiation to space.
d. Earth’s surface absorbs little of the energy that strikes as solar radiation.
Answer: c. The Earth’s surface is responsible for a small fraction of heat radiation to space.
Explanation:
In later ages the large amount of sun's energy is reflected back by the terrestrial surface back to the space. But now due to the abundance of large concentration of greenhouse gases in the atmosphere is responsible for the absorption of thermal energy from sunlight by these gases causing the atmosphere to be hot. This is the reason of global warming. Now only small fraction of heat is radiated back to the space.
According to cell theory, which activity is impossible?
A. Heart cells forming from other heart cells
B. Plants using energy from the sun
C. Cells being formed from pure water
D. Eukaryotes being in a multicellular organism
The correct answer is option (c). Cells being formed from pure water.
The cell is composed of many different substances. All the different substances of the cell cannot be obtained by pure water only.
The pure water only contains hydrogen and oxygen molecules. But, the most abundant atom in the cell is carbon and also have nitrogen, sulfur and other atoms. Pure water cannot provide atoms other than hydrogen and oxygen, so, it is impossible for the cell to be formed by pure water.
Turkins, a cross between a chicken and a turkey, are raised on some farms in Wyoming. This is an example of _____.
a)selective breeding
b)hybridization
c)cloning
d)recombinant DNA
Answer:
b) hybridization
Explanation:
Hybridization is the process of generating an offspring known as a hybrid from a cross between two individuals belonging two different species in order to accommodate the characters of these species into a single individual.
Since chicken and turkey are different species, a cross between them would lead to the generation of a hybrid known as Turkin.