Question

like all living things, cells need to maintain homeostasis, or a state of internal stability. to do this, cells must be able to bring in essential molecules and expel waste products. these molecules move in and out of the cell by crossing the cell membrane. some molecules need to use energy from the cell to move across the membrane. this movement is called active transport. other molecules can cross the cell membrane without using cellular energy. this movement is called passive transport. select the true statements. some molecules cross the cell membrane without using cellular energy. passive transport requires energy from the cell. molecules exit the cell by crossing the cell membrane. cells must maintain homeostasis.

Explanation:

The text states cells need to maintain homeostasis and molecules cross the cell - membrane via passive (no energy) or active (energy - using) transport. Passive transport doesn't need cell energy.

Answer:

A. Some molecules cross the cell membrane without using cellular energy.
C. Molecules exit the cell by crossing the cell membrane.
D. Cells must maintain homeostasis.