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>
According to the American Pregnancy Asociation, pregnant woman shall eat 75 to 100 grams of protein per day.
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The bacteria would be genetically more similar. (apex)
