The invertebrate that i choose was the jellyfish which is in the family of cnidaria. Jellyfish have been living in the ocean way before the dinosaurs even existed which makes them the oldest multi-organ animal. The jellyfish does not have a respiratory, circulatory or digestive system, but they do have manubrium which connects the mouth and the anus at the base of the bell. The jellyfish have a loose network of nerves which is located in the epidermis. Some jellyfish have a lifespan of only a fe hours while some have a few months, but some deep sea jellyfish can leave to a few years.
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