Question

multiple choice question a passive process called involves substances moving down their concentration gradient through protein channels or carriers in the cell membrane. o simple diffusion o facilitated diffusion o endocytosis o active transport

Explanation:

Facilitated diffusion is a passive transport mechanism where substances move down their concentration gradient through protein channels or carriers in the cell - membrane. Simple diffusion does not involve protein channels or carriers. Active transport moves substances against their concentration gradient and requires energy. Endocytosis is a process of taking substances into the cell by engulfing them.

Answer:

C. facilitated diffusion