Areas along tectonic plate edges are usually prone to volcanic eruptions. Areas like this in the ocean can develop large islands during volcanic activity. Out of which rock are these islands most likely formed? A. igneous rock, formed when liquid magma erupts onto Earth's surface where it cools and hardens B. igneous rock, formed when sediments from volcanic eruptions collect and cement into layers C. metamorphic rock, formed when sediments from volcanic eruptions collect and cement into layers D. metamorphic rock, formed when liquid magma creates high temperatures and pressures on Earth's surface​

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?