Which of the following organisms does not have both muscles and skeleton for movement? (a) Dog (b) Snail (c) Earthworm Human being

None.

Human beings and dogs have endoskeleton and muscles.

Snails have exoskeleton and muscles.

Earthworm does not have a skeleton. It has two sets of muscles one that makes it long and thin and the other that makes it fat. The contraction and relaxation of

these muscles help in movement.