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Question

Oxygen molecules enter the cell through the cell membrane by ________, which is a type of _______ transport.

A
endocytosis, active
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B
endocytosis, passive
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C
diffusion, active
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D
diffusion, passive
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Solution

The correct option is D diffusion, passive
Diffusion is the movement of particles or molecules from an area of high concentration to an area of low concentration. Since there is no energy required in this movement of particles, it is termed as a passive transport. Movement of oxygen across the cell membrane is an example of diffusion as the concentration of oxygen is greater outside the cell than the inside.

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