HELP I WILL MARK YOU BRAINLIEST!

a

Explanation:

These gases come in and out of a tree through tiny pores on its leaves called stomata. These gases are part of a process called photosynthesis. Trees take in carbon dioxide from the air, use sunlight as energy to turn that carbon dioxide into sugars, and then uses those sugars as their food.

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.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.