Which of the following tells you what you need to know about population density a. the number of tracks per year
b. the number of crabs on the beach
c. the number of deaths per year
d. the number of mold per square millimeter

Which characteristics are typical of a human population in the postindustrial stage?

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

Which of the following molecules could pass through the plasma membrane by simple diffusion? a. na+ ions b. glucose c. amino acids d. carbon dioxide