The adaptation of the body shape of snakes has resulted in one of their lungs becoming vestigial. Another adaptation (to a fossorial lifestyle) is snakes’ absence of limbs. If the “mystery organism” has also become adapted to a fossorial lifestyle, though its ancestors moved about on the surface, then which structures should one expect to find upon dissecting the organism?1. reduced or absent pelvic and/or pectoral girdles 2. metanephridia 3. hydrostatic skeleton

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