Help please ! Help please

Which is true of the regious near earth equator

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

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