<Tr> <Th> </Th> <Th> Epipelagic </Th> <Th> Mesopelagic </Th> <Th> Bathypelagic </Th> <Th> deep sea benthic </Th> </Tr> <Tr> <Td> muscles </Td> <Td> </Td> <Td> muscular bodies, ossified bones, scales, well developed gills and central nervous systems, and large hearts and kidneys . </Td> <Td> poorly developed, flabby </Td> <Td> </Td> </Tr> <Tr> <Td> skeleton </Td> <Td> </Td> <Td> strong, ossified bones </Td> <Td> weak, minimal ossification </Td> <Td> </Td> </Tr> <Tr> <Td> scales </Td> <Td> </Td> <Td> yes </Td> <Td> none </Td> <Td> </Td> </Tr>

Where do most fish live in the ocean