Cellular respiration
Explanation:
The energy animals need for their life functions are released when their cells carry out cellular respiration.
Cellular respiration is a metabolic process by which living organisms breaks down organic molecules using oxygen especially glucose to produce energy and gives off carbon dioxide and water in the process.
It is the reverse of photosynthesis.
During this process, chemical energy stored in food substances are released and converted to heat energy.
The process takes place in the mitochondria of a cell.
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Answer:
NADH and FADH2 carry electrons to specialized cell membranes,where they are harvested to create ATP.Once the electrons are used, they become depleted and must be removed from the body. Oxygen is essential for this task. Used electrons bind with oxygen; this molecules eventually bind with hydrogen to form water
Explanation:
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Answer:
D. Selection has led to decreases in the size of fish at the age of reproductive maturity.
Explanation:
The larger body size of the fishes is not an adaptive trait as it reduces the survival chances of these fishes. The process of natural selection tends to increase the frequency of the traits that increase the survival fitness of the organisms. Here, the fishes with smaller body size at the reproductive age have greater chances of survival and would reproduce more to leave more progeny. Over the generations, the selection pressure would increase the proportion of fishes that are smaller during reproductive age.
