Which of the following factors would prevent the ecosphere being classified as a closed system?
The input of solar energy
The re-radiation to space of heat energy
O The arrival of rocks as meteorites from space
The unstable state of its equilibrium

cell regulation is conducted by special proteins.

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.

true skin; another name for the dermis. lies directly beneath the epidermis and is often referred to as the true skin. outermost layer of epidermis, consisting of dead cells.