Speciation can occur when two populations of a species become separated from each other. What is the best explanation for why speciation occurs?
OA. Populations of the same species continue to interbreed even after they have been separated.
OB. Populations of the same species living in different environments tend to change in different ways.
OC. One of the populations tends to begin breeding with a different species and produces sterile offspring,
OD
One of the populations loses the ability to produce viable offspring and becomes extinct.

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?

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

Most enzyme names end in the