Locomotion And Movement Question 40
Muscles must have something rigid to pull against if they are to cause movement. In case of humans, the rigidity is supplied by bones; in the case of earthworms, the rigidity comes from the cuticle.
Options:
A) A hydrostatic skeleton; an endoskeleton.
B) Opposing muscles; an exoskeleton.
C) An exoskeleton; an endoskeleton;
D) An endoskeleton; a hydrostatic skeleton.
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Answer:
Correct Answer: D
Solution:
[d] An exoskeleton is a hard encasement deposited on the surface of the animal; an endoskeleton consists of hard supporting elements, such as bones, buried within the soft tissues of an animal.
BETA
