Explain how trait variations give reproduction advantages Practice Test

A population of dark-colored moths moves into an area with light-colored moths. The area has lots of birch trees. The dark-moths stand out against the white and grey trees. More dark moths are eaten by predators than light moths. Only moths that live to reproduction age will produce offspring.

Which moth or moths has the advantage because of their traits to get the change of reproducing?

In the cold tundras, ice and snow cover the ground for most of the year. Animals have to have strong traits to survive long enough to find a mate and reproduce. Female animals only want the strongest males with the best characteristics to pass on to their offspring.

Which animal would be more likely to live long enough to reproduce in this type of environment?