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An aquarium is a constructed ecosystem.
1) It consists of a rectangular tank with glass walls.
2) It has a lid which has several openings for the circulation of air.
3) We must put the abiotic components.
4) Sand must be washed before introducing it into the tank....................Read
http://www.indiastudychannel.com/resources/136542-Aquarium.aspx
An ecosystem refers to communities of organisms dependent on each other. Pond ecosystem is a very good example of quatic ecosystem.
In pond ecosystem 2 main components are found
1) Abiotic components
2) biotic components.
1) Abiotic components : are non living components and divided into physical factors and chemical factors.Water is the main.
2) Biotic components : are living components and divided into
Producers - autotrops
Consumers - meterotrops
Decomposers..................Read
http://www.indiastudychannel.com/resources/136536-Pond-ecosystem.aspx
The brain is a continuation of the spinal cord. It is a highly integrated and a complex system of a vast mass of neurons. It's average weight is about 1360 gms in man and 1250 gms in woman. The brain is situated in the head under the bony structure of the skull. Roughly hemi - spherical in shape. It is made up of a mass of white soft substance known as cortex. It is made up of 3,000 million nerve cells. The physiologists divide the brain into five divisions they are..............Read
http://www.indiastudychannel.com/resources/140968-Description-functions-Brain-Spinal.aspx
