Which of the following is not true of viruses? a. they usually infect specific types of cells. b. they're nonliving particles. c. they reproduce on their own without hosts. d. they're able to crystallize.

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