The changes. You are measuring change. It could be Temperature, height, or any other form.
The answers are following
1)a
2)a
3)d
A movement of alleles resulting from migration. I hope I helped
During the water cycle some of the water in the oceans and freshwater bodies, such as lakes and rivers, is warmed by the sun and evaporates. During the process of evaporation, impurities in the water are left behind. As a result, the water that goes into the atmosphere is cleaner than it was on Earth.
The answer is D. Because the bird has to be noticed and the brighter the feathers the more likely the chance to be noticed.
