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Lemur [1.5K]
3 years ago
6

Ralph is looking at a blood vessel under a microscope as part of his study about the cardiovascular system. He notices that the

vessel contains blood and has valves. What is the blood vessel that he is observing?
Biology
2 answers:
coldgirl [10]3 years ago
8 0

Answer:

Veins

Explanation:

inn [45]3 years ago
3 0

Answer:

the person is correct its VEINS

Explanation:

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