Some students used vinegar to dissolve away the shells of three eggs to represent animal cells. The students observed the changes in the eggs
when they were placed in different solutions,
Which statement best describes the importance of the cell membrane?

a.) the cell membrane allows solutes to enter the cell, but not water
b.) the cell membrane removes solutes from the cell and into the environment
c.) the cell membrane allows the cell to maintain homeostasis
d.) the cell membrane is a protective barrier that prevents water from entering the cell