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Leeches do not have an elaborate secreti...

Leeches do not have an elaborate secretion of digestive juices and enzymes - Why?

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(i) The leech is sangivorous in habit, sucking the blood of cattle and other domestic animals.
(ii) Digestion takes place in stomach by the action of proteolytic enzyme.
(iii) The digested blood is then absorbed slowly by the intestine.
(iv) Blood is stored in the crop gives nourishment to the leech for several months.
(v) Due to this reason, there is no elaborate secretion of the digestive juices and enzymes.
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