It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
Answer:
vacuole.
Explanation:
The function of the vacuole is to store fluids for the cell.
Answer:
Around 100,000 years ago, the Earth was going through a period of Ice Age. While the Glacial Period was not in full effect, it is reasonably concluded by researching the ending of the Ice Age and other Glacial Periods that the Earth was considerably colder than it is right now.
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