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Biology, 07.10.2019 20:30 toot3715

Oxygen enters the nose and follows the path to your lungs. cilia keep the oxygen that moves into your lungs clean. next aveoli allow oxygen from the air to pass into your blood. all of these parts working together create a very important process for humans. what is this process called?

a) digestion

b) evolution

c) reproduction

d) respiration

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