Cnidaria- Cindaria is a phlum that are found in aquatic environments. There are over 10,000 species including jellyfish, sea anemones, corals, and hydras. They are soft bodied and are the simplest animals to have specialized tissues. Some cindaria live in colonies, while others live independently. Even though the species are very diverse, they all have stinging cells called nematocysts.
Coral
Coral is a species of cnidaria in the Anthozoans class. Coral lives in shallow water and feeds on small fish and plankton. Coral's venomous tentacles allow it to kill its pray and bring it into its stomach. The excretory system of coral is rather simple; once its food is digested, the mouth reopens and allows waste to leave the coral. The waste then drifts away in the water's current.
Hydra
Hydra are very small, freshwater animals that are part of the phylum Cnidaria. They live in ponds, streams, and lakes found in tropical regions. Like coral, they use their tentacles to kill their prey. The tentacles of a hydra can extend 5 times the size of its body. The tentacles coil around the prey and the hydra will stretch its body to start digesting its prey. Like carol, once its done digesting the waste is discharged out of its mouth.
Jellyfish
Jellyfish are found in every ocean. They are members of the Cnidaria phylum and their are more than 1000 different spices of jellyfish. They float around in the water feeding on plankton, fish eggs, small fish and other jellyfish. The excretory system is about the same exact as the other cnidaria animals. It uses its tentacles to kill prey and bring it to its mouth. Then when the prey has been digested, waste is realized out of the mouth.