(a) Enumerate the principal structural specializations of Annelida towards
an efficient locomotion. How is the locomotion in a leech different
from that in Nereis and earthworm?
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Annelids follow the locomotors motion of Metameric in which the body is divided into repeated sections along with the posterior or anterior axis that evolves as the adaptation to burrowing.
The earthworms live in soil by contraction and relaxation process that lengthens the body for their movement.
Whereas Nereis usually crawls to for the movement.
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