Write down four general characters of Porifera.
(i) Sessile, sedentary, and marine except one group that lives in fresh water. These are non-motile animals attached to some solid support.
(ii) Simplest multicellular, diploblastic animals.
(iii) The body design involves minimal differentiation and division into tissues.
(iv) Asymmetrical or radically symmetrical.
Example: Sponges and Sycon.