★ Absorption, Lymphatic System, and Blood Vessels Quiz
How many layer(s) of cell is/are there in structure Z?
A. 1
B. 2
C. 3
D. 4
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What is the function of red blood cells?
A. to fight infection
B. to aid in blood clotting
C. to transport oxygen to our tissues
D. to give our blood its blue color
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