The ocean and the atmosphere serve as long-term storage areas for carbon and other nutrients. What are these storage areas are called ? •reservoirs
•fossil fuels
•biostorages
•compounds

What is thought to have caused the mass extinction at the end of the cretaceous period?

Environmental differences within ecosystems are generally caused by

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?