Which of the following supports the hypothesis that life has changed over time? a. prokaryotes have no nucleus b. the cell has no membrane c. some fossil plants have deep roots d. fossils are distinct from rock layer to rock layer

Which of the following is a difference between a food chain and a food web? selected: a. food webs contain both plants and animals. food chains only contain animals.this answer is incorrect. b. food webs show energy transfer. food chains show which animal eats which animal. c. food webs separate organisms by tropic level. food chains do not. d. food webs are a complex patterns of energy flow. food chains only show one line of energy flow.

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.

In what part of the body does the most muscle activity happen?