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Explain why humans need a circulatory system to transport oxygen, while single-celled organisms like the amoeba do not.​
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Explain why humans need a circulatory system to transport oxygen, while single-celled organisms like the amoeba do not.​

User Tom Scrace
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Answer: Single cell organisms dont need a respiratory system because oxygen and carbon-dioxe diffuses between their body tissues and the enviorment.

User Strangeoptics
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