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An Intiative by Sri Chaitanya
a
fertilisation is internal and development is direct
b
fertilisation is internal and development is indirect
c
fertilisation is external and development is indirect
d
fertilisation is external and development is direct
answer is B.
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Detailed Solution
In sponges, fertilisation is internal and development is indirect. They have a larval stage which is morphologically distinct from the adult in their life history.