Answer:
Clogging engine cooling systems - Bra Mussels
Extinction of bandicoots - Feral Cats
Blocking water boats - Water Hyacinths
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I think is osmosis
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In medusae, mesoglea comprises the bulk of the animal and forms a resilient skeleton. In polyps, the water-filled coelenteron acts as a hydrostatic skeleton, which, in concert with the mesoglea, maintains the form of these animals. Muscles in cnidarians are extensions of the bases of ectodermal and endodermal cells.