Though redundantly described as a resting phase, interphase does not really involve rest. Comment.

In a circular motion of a particle the tangential acceleration of the particle is given by a_(1)= 2m//s^(2) . The radius of the circle described is 4 m. The particle is initially at rest. Time after which total acceleration of the particle makes 45^(@) with radial acceleration is :

(A): When a shell at rest explodes, the centre of mass fragments Continues at rest (R) : In explosion the linear momentum of the system does not remains conserved.

(A) : When an electron and proton are released from rest, though they are moving their center of mass remains at rest. (R ) : Proton is heavier than electron.

The body of sponges does not possess tissue level of organisation, though it is made up of thousands of cells. Comment on it.