<Tr> <Th> </Th> <Th> Sponges </Th> <Th> Cnidarians and ctenophores </Th> </Tr> <Tr> <Th> Nervous system </Th> <Td> No </Td> <Td> Yes, simple </Td> </Tr> <Tr> <Th> Cells in each layer bound together </Th> <Td> No, except that Homoscleromorpha have basement membranes . </Td> <Td> Yes: inter-cell connections; basement membranes </Td> </Tr> <Tr> <Th> Number of cells in middle "jelly" layer </Th> <Td> Many </Td> <Td> Few </Td> </Tr>

Where does sponge live and what is it like there