Any living thing. It could be a bird, fish, anything with life.
The sun with out it nothing would exist it would just be a cold solid rock floating through space.
the meaning is that the cell is filled by choroplast.
In classical mechanics, a particle is in mechanical equilibrium if the net force on that particle is zero. ... In terms of momentum, a system is in equilibrium if the momentum of its parts is all constant. In terms of velocity, the system is in equilibrium if velocity is constant.
