Plasma membranes are selectively permeable. this means that

a)anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy.
b)plasma membranes must be very thick.
c)the plasma membrane allows some substances to enter or leave a cell more easily than others.
d)glucose cannot enter the cell.

What protects the lining of the stomach from acidic gastric juices?

Which of the following statements most accurately describes convergent evolution? the process in which two similar species evolve separately from each other and share similar characteristics the process in which a single species evolves into two or more new species the process in which two entirely different species evolve in response to each other the process in which two different species evolve separately from each other but still share similar characteristics

Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.