Ventilation systems are needed in a <span>multicellular organism to actually obtain oxygen and give out carbon dioxide. Without this ventilation system, it would be very difficult for multicellular organisms to survive. It has been also observed that surface diffusion is not enough for a multicellular organism to breath.</span>
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Countable: dogs, cats, sheep, trees, roads, signs, men, women, planets, universes
Uncountable: rain, water, dirt, flour, wine, wood, plastic, glass, dust, grass
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we can do it together.. we can do a zoom call.... im workingon that right now
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lol im doin the same thing
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have a good day but ion know the answer..
