Answer: i think its C. but find another source just in case.
The answer is natural selection.
In natural selection, genotype variations that will increase the chance
of survival and reproduction of some organism are preserved and will be
inherited. Red and green colors of butterflies increased the chance of their <span>survival and reproduction, so these traits will pass to the next generation.</span>
D. Estuaries
Estuaries are a place where fresh and salt water mix.
