What is a biotic factor in a coral reef ecosystem? a)dissolved oxygen in water b)lion fish c)level of the tide d)level of salinity

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