In the section "investigating life: cutting off a tumor's supply lines in the war on cancer", the standard chemotherapy drug forms crosslinks between the two strands of dna in a chromosome. how is this effective in chemotherapy?

9. the history of life on earth is recorded in

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

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