Question

some molecules require cellular energy to pass through the cell membrane. other molecules
can pass through the cell membrane without energy from the cell.
complete the sentence.
active transport
passive transport
molecules that cross the cell membrane by
require cellular energy to
cross, while molecules that cross the cell membrane by
do not.

Explanation:

Active transport requires cellular energy to move molecules against their concentration gradient. Passive transport, like diffusion or osmosis, occurs without energy input as molecules move down their concentration gradient.

Answer:

Some molecules require cellular energy to pass through the cell membrane. Other molecules can pass through the cell membrane without energy from the cell. Molecules that cross the cell membrane by active transport require cellular energy to cross, while molecules that cross the cell membrane by passive transport do not.