Which organisms does not have both muscles and skeleton for movement
Which of the following organisms does not have both muscles and skeleton for movement?
- dog
- snail
- earthworm
- human being
Answer
Snail does not have both muscles and skeleton for movement. The shell (i.e. external skeleton) serves for muscles attachment and protection. The movement is carried out only with the help of large disc-shaped muscular foot that has two sets of muscles.
In earthworm, a hydro static skeleton (fluid filled cavity surrounded by muscles) is present. The alternate contraction and relaxation of muscles and pressure of the fluid helps in burrowing.
Dog and human beings have muscular skeletal system for movement.
The correct option is B.