What do the tropopause, stratopause, and mesopause all have in common? each is a a. point of maximum temperature in its layer of the atmosphere. b. region of increasing pressure in its layer of the atmosphere. c. zone where both temperature and pressure fall in the atmosphere. d. boundary where temperature trends reverse in the atmosphere.

Option D; boundary where temperature trends reverse in the atmosphere.

Explanation: Tropopause is the boundary in the Earth's atmosphere between the troposphere and the stratosphere, and is a thermodynamic gradient stratification layer.

Stratopause is the boundary between the stratosphere and the mesosphere, here you will find the highest temperature in the atmosphere

Mesopause is the point of minimum temperature at the boundary between the mesosphere and the thermosphere atmospheric regions.

So all of them are boundaries, and in each you will see that in all of them a change in temperature occurs, so the correct option will be D.

a is the best answer your welcome