The amniotic egg is a characteristic of
a. amphibians.
b. reptiles.
c. birds.
d. both
b. and
c.

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?

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