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Morphology of Cockroach

What is the f...

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What is the fertilisation in cnidaria , annelida , mollusca (internal or external ) ..??? And development in cnidaria and annelida ( direct or indirect )...???

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Solution

Fertilization
cnidaria ; internal or external
Annelida : internal in monoecious or external in dioecious
mollusca: internal or external (diocious animals)

Development
Cnidaria ; - indirect with larval stage
Annelids ; direct with no larval stages

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