* What does it mean when a cell is selectively permeable?

large molecules can enter the cell

everything can enter the cell

small molecules can enter the cell

only some things can get into the cell

How did alexander fleming’s research solve a societal problem? he developed ways to treat inherited diseases. he advocated for regular hand washing to kill germs. he discovered a new type of medicine that could treat infections. he discovered the cause of mad cow disease, an emerging disease.