slow down transpiration by the stomata.
A.
Guard cells; closing
B.
Chloroplasts; closing
C.
Guard cells; opening
D.
Chloroplasts; opening

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Where can you find prokaryotic and eukaryotic cells?