In a cell, what is the function of the Cell Membrane?
A. It only maintains the cell shape
B. It removes waste and stores ingested food
C. It controls entry and exit of substances
D. It generates energy for the cell

The answer is C :

It controls the entry and exit of substances.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

the answer would be a