What is the importance of various species in the ecosystem?

(i) We have selected our crops from the reserve of edible plants from a biodiverse environment.
(ii) We have also experimented and selected many medicinal plants.
(iii) The animals Were selected from large stocks to serve as milch animals.
(iv) They also provided us draught power, transportation’ meat and eggs’
(v) The fish provide nutritive food.
(vi) Many insects help in pollination of crops and fruit trees’
Every species has a role to play in the ecosystem’