Which type of cell transport is used by mitochondria to make hydrog
ions move against their concentration gradient?
A. Osmosis
B. Endocytosis
C. Facilitated diffusion
D. Active transport

D. Active transport

Explanation:

Any molecule that requires being moved against the concentration gradient must use ATP energy, making it active transport. Facilitated diffusion and osmosis are both types of passive transport, which means they dont require any energy to move to where they are needed.  

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explanation:

the answer would be..

b. sucking