The biospher concept.

First of all what is a biosphere?A biosphere is a global ecological system comprising all of earths communities or ecosystem.And it comprises all parts or earth that supports life.Biosphere reaches from the floor of the ocean to the top of highest mountain.All together biosphere is 20 km thick.

If earth were the size of apple the layer that supports life would be only about thick as the apple's skin.All things from living to non-living and from micro to giant.Chemical composition their cycles in nature,their function,growth of organisms,their energy level,and their prey will be discussed in term of biosphere.