Natural selection is most responsible for which of the following?

the development of genetic mutations within a population of organisms

the passing of fatal diseases from one organism to another

the preference that some species have for certain environments

the great number of different species of organisms that have existed on earth

At which location in earth’s interior does the top density continue to increase as thickness decreases?

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?

The term equestrian relates to which animal? bulls cows horses pigs