Answer:
number 2 The South american plate and african olate moved apar gradually
Gene pool is the variety and available genes in a specific population of a species .
Answer:
radiation because a few examples 1 cause if you were to take rads head on you would get a mutation 2 look at most of fallouts enemies
Answer:
Organisms with hard parts such as a shell,or bones are much more likely to become fossilized than animals with soft parts like a worms.
Explanation:
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Answer:
Extrinsic regulatory mechanisms are external and depend on the firing of some factor outside the population itself. Among them are interspecific competition, food and space restrictions, very strong climatic variations, weathering and inharmonious relationships with other populations (parasitism and predatism).
Good examples of interspecific competition appear when rabbits, caves, rats compete for the same plant, or different fish and birds, such as the heron, vie for the same species of smaller fish. This is because these different species keep their populations in the same ecological niche. Competition is often so strong that some species eventually, as one example of an extrinsic homeostatic mechanism overriding an intrinsic homeostatic process is their disappearance or migration to other regions.
In this competition, the presence of adaptations among individuals in the population that promote better food search, speed, vision, and others can make the difference between elimination and survival.
