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Porifera symmetry
Asymmetrical.
Porifera cephalization
Absent.
Porifera segmentation
Absent.
Porifera digestive system
Intra-cellular digestion.
Porifera circulatory system
None.
Porifera respiratory system
Diffusion.
Porifera excretory system
Diffusion.
Porifera nervous system
None.
Porifera reproduction
Sexual and asexual through budding.
Porifera support
Skeletal structure made of spicules.
Cnidaria symmetry
Radial symmetry.
Cnidaria cephalization
Absent.
Cnidaria segmentation
Absent.
Cnidaria digestive system
Gastrovascular cavity.
Cnidaria circulatory system
None.
Cnidaria respiratory system
Diffusion.
Cnidaria excretory system
Diffusion.
Cnidaria nervous system
Nerve net.