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the blood vascular system of mammals is ...

the blood vascular system of mammals is known as double vascular system because

A

A group of veins carry oxygenated and other group conduct deoxygenated blood

B

Oxygenated blood runs from heart ot different organs by one set of veins while deoxygenated blood runs from heart to lung by another set

C

The two different systems never meet

D

all of the above

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The correct Answer is:
D
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