Which term describes the picture? impermeable:
doesn't allow any
molecules to pass
through
permeable: allows
all molecules to
pass through
selectively
permeable: allows
only certain
molecules to pass
through
all are correct

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

Actinobacteria sp. are fermenting organisms (which do you use oxygen to breathe) referred to as chemoorganohetereotrophs this means they break down organic material and convert it to inorganic material. which part of the carbon cycle does this describe

Contrast how pollination is different among gymnosperms and angiosperms.