All of the following contributed to speciation in darwin's finches except
a. changes in gene pools.
b. lack of competition.
c. behavioral isolation.
d. geographic isolation.

Which organelle releases chemicals that break down large food particles into smaller ones?

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

The many stone tools, fragmentary animal bones, and teeth found at gran dolina, spain, indicate that hominids there? a. processed and consumed animals and other hominids. b. did not differ appreciably from earlier asian homo erectus. c. were similar to later homo sapiens. d. none of the above