Answers

2016-03-11T18:59:37+05:30
Bcoz it is made by human...
0
2016-03-11T19:04:45+05:30
crop fields are not like wild forest area, the piece of land which has to be converted into crop field is manged. the soil is prepared for sowing seeds, then irrigated and further also kept under observation for getting good yield of crops. this is why it is also called artificial ecosystems.
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