What is the best summary of the passage external and internal stimuli? A. An external stimulus comes from outside of the organism.
B. Stimuli trigger responses in organisms that allow them to maintain constant internal conditions through homeostasis.
C. Homeostasis in a set of mechanisms that work to maintain stable internal conditions as external conditions change.
D. Phototropism is a plants response to turn toward light. Gravitropism is a plants response to grow upward against gravity

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

Climate like that in the sahara desert have the fastest rates of weathering

An organism's reproductive strategy includes all of the following except a. the number of offspring produced. b. the amount of energy expended in producing offspring. c. the length of time parental care is given d. the number of alleles an organism passes on.