UNIT SIX : DETAILED STUDY OF EARTHWORM
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It is found in soil, which is rich n humus. It is found abundantly in rainy season. Other days it is found in soil. The earthworm is usually active at night and so called nocturnal. They feed on soil; digest organic matters and undigested matter are excreted out called castings. The earthworm plough soil, makes soil fertile, and so called farmers friend.
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Biology