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ehidna [41]
3 years ago
8

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

Biology
1 answer:
IrinaVladis [17]3 years ago
7 0

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

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The answer is Model. Hope this helps!!
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rocks can become soil in multiple different ways one could be primary succession which means some algae or moss grows onto rocks with out soil then they slowly gain moisture which attracts some other plants like flowers which then breaks down the rock into smaller things then grasses come in and turns it into soil.

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