System Coral

What do Cnidarians (jellyfish) do if they dont have an excretory sytem?

I was also wondering about the circulatory and respiratory system.

Ooooh, we just learned about this in science. Ok, this might be dull, but here we go:

Circulatory- They don't really have one. Isn't that weird?! But they're not the most complex creatures...so it makes sense.

Respiratory- Living in the ocean, there aer always currents. So, they just filter oxygen out of the moving water. This works especially well for sponges, which are also cnidarians. I mean, they're full of holes, so it works easily. Coral isn't alive though, so they don't "breathe". It's made of the dead, hardened outsides of polyps, which are alot like hydra.

Excretory- Jellyfish pull food into their mouth with tentacles. It goes into this "central cavity" (stomach-like hole) in their body. They take out the nutrients, and what they don't digest just goes out the same way it came in. That's pretty nasty. The same goes for anenomes, hydra, polyps, blah blah blah.

Coral Tech Display System @ Coral Reef Uk Aquatics

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