Describe reproduction in Porifera.

(N/A) $\rightarrow$ Sponges reproduce asexually by fragmentation and sexually by the formation of gametes.
$\rightarrow$ Fertilisation is internal,and development is indirect,involving a larval stage that is morphologically distinct from the adult.
$\rightarrow$ Development is mostly indirect,with larval stages known as parenchymula (e.g.,Leucosolenia) or amphiblastula (e.g.,Sycon).
$\rightarrow$ Examples: Sycon (Scypha),Spongilla (freshwater sponge),Euspongia (bath sponge).