Which teeth fall out in mammals?

Fill in the blank spaces:
$(a)$ All mammals (except a few) have ............. cervical vertebra.
$(b)$ The number of phalanges in each limb of human is ............. .
$(c)$ Thin filament of myofibril contains $2 \,'F'$ actins and two other proteins namely .............. and ........... .
$(d)$ In a muscle fibre $Ca^{++}$ is stored in ............. .
$(e)$ .............. and .............. pairs of ribs are called floating ribs.
$(f)$ The human cranium is made of .............. bones.

Endoplasmic reticulum or sarcoplasmic reticulum plays a major role during

The teeth of a rabbit are . . . . . . .

Locomotion requires a perfectly coordinated activity of:

When the entire sole rests on the ground during walking as in the case of a man,it is known as