Question: Which of the following does not have an anterior and posterior end?\nOptions:\n- (A) Adult mammals\n- (B) Adult reptiles\n- (C) Adult birds\n- (D) Adult echinoderms\n- (E) Earth orbiting the Sun\n- (F) an erupting volcano\n- (G) peachleaf willow\n- (H) sensory neurons
Let's be accurate as possible and think step-by-step.
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Adult echinoderms have radial symmetry. Animals with radial symmetry lack an anterior and posterior end. Adult echinoderms lack an anterior and posterior end.
The answer: (D).
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