There are two types of ecosystems:

1. Aquatic or Hydrospheric ecosystem: It is system in which living components exchange material and transfer energy within water. Aquatic environment is classified into fresh water and marine (salty) water.

(a)   Salt-water ocean and Sea are the largest ecosystems on the earth. They constitute about 71% of the surface of earth. Its example is marine ecosystem.

(b)  Fresh water ecosystem covers less than 1%. Its example is fresh water lake and ponds.

2. Terrestrial or lithospheric ecosystems: The ecosystems present on land or soil are called terrestrial or lithospheric ecosystem. It includes different types of forests, grass lands and deserts.




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