Microevolution - Allele frequency changes in a certain population over an amount of generations, it can also be simply described as "an evolutionary change in populations".
Lymphoid organs in the immune system, includes the bone marrow
The shifting of the plates upset the environment in a negative way and changed the amount of carbon dioxide going into the air.
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Long abd sharp teeth, sharp talons, sharp beak, quiet paws, agile, camouflage