Thursday, May 19, 2011

The world


Life On Earth


A unique combination of of an oxygen-rich atmosphere and plentiful water is the key to life on earth.apart from the  polar ice caps, there are a few area which have not been colonized by animal or plant s over  the course of earth’s  history.plants process sunlight to provide them with their energy ,and ultimately all the earth animal s relay on plants for survival.Because of this reliance ,plants are known as primary  procedures, and the availability of nutrients and temperature  of an area is defined as its primary productivity.,which affects the quantity and type of animals which are able to live there.this index is effected by climatic factors –cold and aridity restrict  the quantity of life,whereas warmth and regular rain fall allow a greater diversity of species.  

Read more about :
·       
           Our ecosystem
·         World biomes
·         Biodiversity
·         Humen being