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Jermain_ Jermain_
wrote...
On Hiatus
Posts: 6410
10 years ago

 
How does the dorsal blood vessel of the earthworm pump blood?   
A)
 
contractile skeletal muscle surrounding the vessel   
B)
 
peristalsis   
C)
 
contractile chamber   
D)
 
It doesn't pump blood. Blood flow is passive.   
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Answer accepted by topic starter
padrepadre
wrote...
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10 years ago
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Jermain_ Author
wrote...
On Hiatus
10 years ago
Excellent answer, thank you padre.
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