Im having trouble with a science question. what are the divisions in earth's atmo sphere primarily based upon? ?

Compare the composition of the moon's surface with the composition of the earth's surface.

When a doggo starts to pace around in the same line for a hand full of days. what would that mean?

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2