Biology
Olive14
55

Why do blood vessels and lymph vessels have valves? to control the volume of blood and lymph to ensure blood and lymph flow back to the heart to regulate hormone release in blood and lymph to block the flow of harmful substances in blood and lymph

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(1) Answers
kaanispir

Answer - To prevent the black flow of lymphatic aka lymph. Reasoning - Reason is because it's to allow proteins to pass and other molecules to do its job.

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