Question: Question 2 1 ( 2 points ) Listen In the 3 rd week of human development, the pacemaker cells of the heart begin t fire.

Question 21(2 points)
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In the 3rd week of human development, the pacemaker cells of the heart begin t fire. By the end of the 3rd week, the heart begins to pump blood through the vasculature.
True
False
Question 2 1 ( 2 points ) Listen In the 3 rd week

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