asked 48.1k views
2 votes
What forces the blood to circulate through vessels in a closed circulatory system?

a.
the notochord

b.
the nerve cord

c.
the cranium

d.
the heart

2 Answers

0 votes

Answer:

the heart, i took the quiz

answered
User Marcus Stade
by
7.8k points
5 votes

Answer:

a.

Step-by-step explanation:

answered
User HLGEM
by
8.9k points
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