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

answer: i don't know

explanation:

you need to provide a picture, otherwise i can't tell you.

if you can provide one, i'd be more than happy to you with this!

tissue

explanation:

it is actually formed by geoup of cells which is tissue