Which cell structure plays a direct role in the release of chemicals from the cell?

Biology 1c cumulative exam i need awsners

This is the interaction of two organisms where one is and the other is neither nor harmed.

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.