Question

select the true statements. the cell membrane controls what enters and exits a cell. the cell membrane maintains a separate environment inside a cell. the cell membrane is rigid. only animal cells have a cell membrane.

Explanation:

The cell membrane is a selectively - permeable barrier. It controls the movement of substances in and out of the cell and maintains an internal environment different from the external one. It is fluid, not rigid. Both animal and plant cells have cell membranes (plant cells also have a cell wall).

Answer:

The cell membrane controls what enters and exits a cell.
The cell membrane maintains a separate environment inside a cell.