SEA ANEmones
The sea anemone is a long living cnidaria that like the jelly fish does not have an excretory system. The sea anemone excretes by releasing waste from its gastrovascular cavity out of its slit-like coelenteron. The slit-like coelenteron is located on top of the sea anemones body.
Jellyfish
Th jellyfish is unlike most animals in the whole world. This animal does not contain any excretory organs. Rather than having a different anus and mouth it has one single multipurpose whole called the orifface. This excretion system is also called the incomplete digestive system. The single whole that the jellyfish posses is called the coelenteron. This cavity digests the jelly fishes food, but also expels it out of its system. One cool fact about the jellyfish is that it never seems to die unless it is killed.
portuguese man of wae
The Portuguese man of war is like the jellyfish but not exactly. This animal is a member of the phylum Cnidaria just like the jelly fish and sea anemone. The Portuguese man of war is a siphonophore, which is multiple organisms that cohesively act as a single body. The Portuguese man of war also lacks an excretory system which is why it is a siphonophore. The The Portuguese man of war kills its prey by paralyzing its victim and absorbs its nutrients. The The Portuguese man of war than releases the waste produced through its outer membrane.