From a population of red, brown, orange, yellow, and green butterflies, only the red and green ones survive since they can blend into their environment and reduce predation. which evolutionary mechanism is involved?

The correct answer is directional selection.

Explanation:

The kind of evolutionary mechanism, which has been illustrated in the given question is directional selection. It is actually a type of natural selection. The directional selection is also known as a positive selection in population genetics refers to a kind of natural selection in which an extreme phenotype gets preferred over other phenotypes, leading to the shifting of the allele frequency with time in the direction of that phenotype.