True or false ? Cell membranes are selectively permeable, allowing only some materials to cross the cell membrane. This property allows cells to maintain homeostasis.

True

Explanation:

Cell membranes are selectively permeable because of the structure of the phospholipid bilayer.

This bilayer only lets certain things in because it depends on the polarity, size,  and type of molecule.

For example, glucose molecules are too large to enter. But, carbon dioxide molecules can go in and out easily because of their small size.

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

your answer is "the 1950's"