what are invertebrates, animals that have backbone, they dosen`t have backbone, animals make toilet, animals do fart, what should we call the simplest gruop of invertebrattes, cats, echinoderms, sponges, worms, what is the main function of the sponges, stinging cell, parasitic organism, non of these, what are example of the echinoderms, starfish, jellyfish

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