The first tetrapods were\nOptions:\n- (A) major threat to health\n- (B) remains of prehistoric life\n- (C) in the frog family\n- (D) running and lifting\n- (E) competing for resources\n- (F) warm-blooded\n- (G) objects that have mass\n- (H) graptolites Think carefully first, then make a decision. My thoughts:
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Amphibians are the first true tetrapods, or vertebrates with four limbs. All frogs are amphibians. Animals in the frog family are the first true tetrapods. So the answer is (C).
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