What must be true for natural selection to happen?
A. All organisms must reproduce the same amount.
O
B. There must be genetic variation in the population.
C. The population must be below carrying capacity
O
D. There can be no competition for resources

For natural selection to occur, it is true that there must be genetic variation in the population.

Explanation:

According to evolution, natural selection implies the changes that occur in the genotype of a species, due to the effect of environmental factors, and which guarantee its survival through adaptive evolution.

For natural selection to occur, three fundamental conditions must exist:

Therefore, a necessary factor for natural selection to occur is that genetic variability exists in the population.

Learn more:

Natural selection and genetic variation link

you can have just about every answer you can think of

essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.