Please help me with this problem

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

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

Blank is a rock with a find dark texture that makes up the oceanic crust