Whole ecosystem is too much big and complex to be studied at one time, it is convenient to devide it into two basic categories named as :
Inland and outland ecosystem
Complex and non-complex ecosystem
Estuary and forest ecosystem
Terrestrial and aquatic ecosystem
As we learn
Terrestrial and the aquatic Ecosystem -
Since whole ecosystem is too much big and complex to be studied at one time, it is convenient to divide it into two basic categories, namely the terrestrial and the aquatic.
- wherein
Forest, grassland and desert are some examples of terrestrial ecosystems; pond, lake, wetland, river and estuary are some examples of aquatic ecosystems.
Correct option is 4