It takes place <span>between the alveoli and capillaries, which are located in the walls of the alveoli.</span>
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It's Gills because there not human and use gills to breathe in water
There are 200 different cells in a human body and within those cells there are about 20 different types of structures or organelles .
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<h2>A shadow is an area where direct light from a relatively small source is blocked by some opaque object. If the source is genuinely the only light around, the shadow will be absolutely black, and will have no colour.</h2>
