Sea corals live exclusively in the ocean and are radially symmetrical. they have microscopic stinging barbs that shoot out to immobilize their prey. this allows corals to hunt even while they are stuck to the ocean floor. what animal phylum do corals belong in? chordates mollusks cnidarians annelids

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

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?

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming