In biology and ecology the environment is all of the natural materials and living things, including sunlight.

*Environment

*Ecology*the branch of

biology that deals with the relations of organisms to one another and to their physical surroundings

*Different ecosystem*The ecosystems

are of many different types and are classified based on a number of factors . Basically there are two types of ecosystems, the aquatic ecosystems and the terrestrial ecosystems.

*Aquatic Ecosystem

*An ecosystem which exists in a body of water is known as an aquatic ecosystem.

*aquatic ecosystems are mainly of two

types* freshwater ecosystems

* marine ecosystems

*Terrestrial Ecosystem

*The ecosystem which is found only on landforms is known as the terrestrial ecosystem

*main types of terrestrial ecosystem

*the grassland ecosystems

*the mountain ecosystems

atmosphere

*Atmosphere*Atmosphere of Earth,

which is mostly nitrogen, also contains oxygen used by most organisms for respiration and carbon dioxide used by plants

. Earth has four primary layers

*Thermosphere *Mesosphere*Stratosphere *Troposphere

*biodiversity

*Biodiversity refers to the variety of life and its processes.

*Independence and interrelationship of living

organism

*All major components of the environment viz., Air, Water, Land, Energy and Living beings including man are inter-related and inter- connected in one way or the other