Who was the marine biologist whose book silent spring spelled out how the insecticide ddt kills birds and other animals and causes sickness among humans, and who launched the modern environmental movement?

Rachel Carson

Explanation:

Rachel Carson was an American marine biologist and author. She wrote the book Silent Spring to make people aware of the effects of pesticides on the environment. Her book was extremely controversial, particularly for the chemical companies. However, as a result of the information contained in the book, the national pesticide policies were changed and DDTs (as well as other pesticides) were banned, thus launching the modern environmental movement.

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.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.