Which statement best explains why organisms of the same species that become isolated eventually become different from
each other over time?
Their DNA mutates.
They are exposed to different environments.
They both find ways to survive.
They do not have any of the same genes.

They are exposed to different environments.

Explanation:

The isolated organism should have the same gene pool. This gene pool should be maintained if there is no other factor that disrupts it.

But the condition of the habitat might be different and this will create a natural selection. The environment will give advantages to certain traits while giving disadvantages to other traits. But a different environment will support different traits, so this can create variation.

the overall balanced equation

6co2 + 6h2o > c6h12o6 + 6o2

sunlight energy

where: co2 = carbon dioxide

h2o = water

light energy is required

c6h12o6 = glucose

o2 = oxygen