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common names for Cnidarians are Jelly fish, corals, and hydras

Cnidarians have a Radial Symmetry body type which means that their body parts are arranged on an axis. They also have two different forms and these include Polyp and Medusa

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Cnidarians have many different changes from Phylum

Some of the most popular changes are that it now has a nervous system which allows a simple nerve net for responses. It also now has muscle like cells that allow it to move as well as organized tissue.

Cnidarians can reproduce both asexually and sexually. They asexually reproduce by budding and they sexually reproduce by releasing sperm and eggs into the water which leads to fertilization

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There is a great range from Cnidarian life span and it all depends on the organism. For example jelly fish can live anywhere from a few hours to years. Another cnidarian like coral can live up to a thousand years so the range is between hours to years.

there is over 10,000 different species of cnidarian that exist.

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Cnidarians are carnivorous but others are symbiotic. Cnidarians usually catch prey with their tentacles along with something called cnidocytes. Other cnidarians like corals get nutrients from algae.

They digest food through something called a gastrovascular cavity and this is where the food breaks down. After it is digested it goes out through the same hole it came in. This means that they have an incomplete digestive system.

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There is Cnidarian called the "Immortal Jellyfish" and its called this because it can revert back to its juvenile stage which makes it basically immortal.

Coral reefs are one of the most biodiverse ecosystems on earth allowing all kinds of life

Some jellyfish have eyes with lenses, corneas, and retinas allowing them to see without a brain