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Diffusion is: the process of a concentrated substance moving into an area of lower concentration. the rate at which oxygen is taken in by the alveoli and used by the body. a type of cell that transports
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Diffusion is:

the process of a concentrated substance moving into an area of lower concentration.

the rate at which oxygen is taken in by the alveoli and used by the body.

a type of cell that transports oxygen and carbon dioxide.

a cluster of air-filled sacs that move oxygen through the body.

User Ruslan Plastun
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Answer:

1

Step-by-step explanation:

the answer is the first one

User Hugh Lin
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