A vein always carries:

Biology
Tutor: None Selected Time limit: 1 Day

a.blood rich in carbon dioxide

b.blood to the heart.

c.oxygen-poor blood.

d.blood from the heart.

e.oxygen-rich blood.

May 10th, 2015

.blood to the heart..........................................

May 10th, 2015

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May 10th, 2015
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