Variations are beneficial for the survival of the species. Populations of organisms fill well-defined places, or niches, in the ecosystem, using their ability to reproduce.However, if some variations were to be present in a few individuals in these populations, there would be some chance for them to survive.
A redshift is when light or other electromagnetic radiation from an object moves away from the observer.
The answer is (2)
(1) and (3) are obviously wrong.
If thy stop reproducing then the whole population could die and (3) is just crazy.
(4) is also inncorrect because of they run out of foo then they all will die.
(2) is the one that makes the most sense
Osmosis - the control of letting water pass through our cells
