The body of the snail is covered with a __________
Soft skin
Hard shell
Rough skin
None of these
Movable joints of the backbone are ___________ joints.
Fixed
Pivotal
Hinge
Gliding
The three pairs of jointed legs attached to the __________ region help cockroach to walk.
Breast
Head
Leg
Stomach
The knee joint is a _________ joint.