They're a colonial species (i.e., they make colonies), so it's just another form of reproduction.
There seems to be some evidence that they also split due to stress. I.e., injury or other. Two halfs might stand a better chance of "making it" than one whole.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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