Which of the following structures is an extension of the petiole into the leaf blade?
a. lamina
b. mesophyll
c. midrib

Liquid water turns into water vapor at which step in the water cycle

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

List two modern organisms that have pentameral symmetry