Which of the following is not a way that protists contribute to the food web?
they fix carbon into organic molecules.
they occupy the apex producer niche.
they enter symbiotic relationships with animals.
they recycle nutrients back into the carbon and nitrogen cycles.

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