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>
The answer is B: Taxonomy allows a better understanding of relationships among species.
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<span>Adjacent-1 segregation and adjacent-2 segregation.
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Yes decaying plants add carbon to the soil
