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1.No shape -asymmetric
2.Radial symmetry -originating from a center points and spreads outward like the spokes of a wheel
3.bilateral-two sides (right vs left)
3 layers
ectoderm-develops into skin and other body covering eg hair nails and nervous system.
mestoderm-develops into muscles and the skeleton (bones)
endoderms -develops into tissues and organs .
segmentation -develops into several body of compartments
movement to land -as invertebrates evolved they moved from having no symmetry to radial symmetry to eventually.
phylum +porifera
sponges the most primitative of all multicellular animals
phylum-cnidaria jellyfishes,man o war ,sea anemones corals hydras
cnidirians all have a structure called a nematocyst
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