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Write about embryonic development in lee...

Write about embryonic development in leech.

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(i) Internal fertilization takes place. This is followed by cocoon formation.
(ii) Cocon is also known as egg case which is formed around the 9th, 10th and 11 th segments.
(iii) Development is direct and proceeds in cocoon which contain one to 24 embryos.
(iv) Young leech resembling the adult emerges.
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