A) Outer skeleton of snail is called shell.
B) Cartilages are not found in joints in body.
C) The bones are earthworm are quite delicate.
D) The earthworm moves by alternate extension and contraction of body using bristles.
Correct Answer: A
Solution :
Cartilages are found in joints. There are no bones in earthworm. The earthworm moves by alternate extension and contraction of body using muscles (not bristles).
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