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>
A solar eclipse is when the moon moves between the earth and the sun, so the moon casts a shadow on the earth
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<em>Kreb cycle occurs in mitochondrial matrix and electron transport system occurs in the inner membrane of mitochondria.</em>
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your gonna have to use your own resources (memory etc.) to tell about your spring break... think about anything you saw or did or whatever including these terms:)
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I'm sure this is the correct amswer
