Carbon dioxide gas
Animals and plants need oxygen. When an animal breathes, it takes in oxygen gas and releases carbon dioxide gas into the atmosphere. This carbon dioxide is a waste product produced by the animal's cells during cellular respiration. Cellular respiration occurs in the individual cells.
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A snowy enviroment. such as a snow fox with white fur surviving better than a snow fox with brown fur. thus white fur fox decrease genetic diversity because it is more sucessful at surviving and reproducing than the brown fur fox
The HCG hormone is the answer possibly
The form of natural selection is called adaptive radiation