Which marine ecosystem has the fewest available nutrients and the lowest productivity?
a) estuaries
b) open ocean
c) coral reefs
d) continental shelf

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