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Sea Cucumber

The sea cucumber is a merine animal which has an elongated body covered in leathery skin and it has a single branched gonad. They can be found on the sea floor worldwide.
The sea cucumbers communicate by sending hormones signals to each other. Also they can change sex during their lifetime.
An interesting fact is that the sea cucumber has elaborate a fascinating defensive system which consists of expelling their internal organs, which will then regenerate.