How could this statement be revised to make it a hypothesis?
a.)fish meal is safer than artificial fertilizers, but it does not make plants grow.
b.)fish meal is a better fertilizer than artificial fertilizer because fish meal is natural.
c.)plants that are fertilized with fish meal will grow taller than plants that receive artificial fertilizer.
d.)plants that receive artificial fertilizer will be better than plants that receive fish meal.

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?