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3 years ago

10

The valves in the heart open and close to move blood in between heart chambers. O a) three directions O b) two directions O c) f

our directions d) one direction

2 answers:

sammy [17]3 years ago

7 0

b) two directions

i think

Sedaia [141]3 years ago

5 0

Answer:

O b) two directions

Explanation:

I think

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