It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
Chemical bond is the right awnser
#6 is A. They are all composed of one or more cells.
Answer:
incoming Paleoindians, the first Americans, who allegedly hunted them to extinction.
The correct answer to this question is this one: a.) bottleneck effect. Increased poaching nearly led to the extinction of the American bison. The kind of effect that does this example represent is called the bottleneck effect. Hope this helps answer your question.
