What is the most important reason the plasma membrane is selectively permeable

to facilitate the transport of substances to and from the cell

Explanation:

phospholipid bilayer allows only certain substances to pass through without it there would be no control of what goes in and out of a cell

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.