The alternation of circular muscle contraction and longitudinal muscle contraction allows the earthworm to move forward. What type of support system aids locomotion in the earthworm?
A. an endoskeleton
B. a hydrostatic skeleton
C. a calcium carbonate shell
D. an exoskeleton
Answer: B
Biology & Microbiology
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1.inhalation
2.indirect contact
3.contact with a vector
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What will be an ideal response?
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