Answer:
Artificial
ecosystems are those ecosystems which are modified and managed by human beings.
Crop fields are man-made, plants do not grow naturally rather most of the
plants are grown by humans according to the season, type of soil etc. Crop
fields are not like wild forest area which is left to the care of nature and
can sustain itself.
In crop fields, the land is managed, soil is prepared for
sowing seeds, then irrigated and further progress is also kept under observation
for getting good yield.
Thus, crop field are known as artificial ecosystems.
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