What is one biotic factor that can change the size of a population in an ecosystem
a. the type of soil present
b. the number of predators present
c. the average yearly temperature
d. the amount of available groundwater
the answer is b. the number of predators present! i'm so

Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species

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?

Plz ! what does it mean for an allele to be dominant?