Please do...
It's only 4 questions

1) Genetic variation can be caused by a mutation

2)the action or process of mutating.

3)Predators of the peppered moth include flycatchers, nuthatches, and the European robin.

4)they would be eaten by birds because they were easier to see.

Explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.