When an earthworm shortens its body, it is contracting its _____ muscles and relaxing its _____ muscles, which _____.
A) longitudinal; circumferential; are antagonists
B) circumferential; longitudinal; are agonists
C) exoskeleton; muscles; are internal to its cuticle
D) muscles; endoskeleton; is formed of protein and chitin
E) None of the answer options is correct.
Correct Answer:
Verified
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