Science, asked by nigpj7879, 10 months ago

Why do humans have a more complex circulatory system than bacteria

Answers

Answered by koushikmkj
1

Answer:

Multicellular animals do not have most of their cells in contact with the external. but more importantly hemoglobin molecules in blood cells transport oxygen. The human closed circulatory system is sometimes called the cardiovascular system

Explanation:

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