The sponge uses cells to digest all of the sponges food.The hydra is green to look like algae in the water and uses its tentacles to paralyze its pray.
The planaria has two little brain's the planaria is also a type of flat worm.the hydra has 4 to about 25 tentacles.The planria digests within the cavity.
The mussel has areal digestive system, where food geus in one end and comes out the other.
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