Which of these best illustrates natural selection? * The largest organisms in a species receive the only breeding opportunities.
An organism with favorable genetic variations will tend to survive and breed successfully.

A population monopolizes all of the resources in its habitat, forcing other species to migrate.

A community whose members work together utilizes all existing resources and migratory routes.

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?

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

The largest unit within which gene flow can readily occur is a