Gene duplication, mutation, or other processes can produce new genes and alleles and increase genetic variation. New genetic variation can be created within generations in a population, so a population with rapid reproduction rates will probably have high genetic variation.
They have a large number of Mitochondria. <span />
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Explanation:
The biome would be the arctic tundra - as it states the weather is cool
For hot summer, I would say forests because it inmcludes trees and crops