B - When many individuals of the same species are available for mating.
And
C - When the individuals live in a stable environment in which they thrive.
If this is a true or false question then the answer is True
Runoff in neighborhoods can be a problem because as the water runs it can collect pollutants such as oil, pesticides, bacteria, etc. These pollutants can end up in our drinking water or can run into our fishing supply and even our swimming water... I wouldn't want to be swimming or eating fish that was swimming in pesticides and bacteria.
