Reptiles lack external ear openings, have a tympanum, typically two limb pairs, a usually three-chambered heart, and are poikilotherms.
Reptiles lack external ear openings, possess a tympanum, usually have two pairs of limbs, usually a three-chambered heart (four in crocodiles), and are poikilotherms.
| Text | reptiles do not have external ear openings. Tympanum represents ear. Limbs, when present, are two pairs. Heart is usually three-chambered, but four-chambered in crocodiles. Reptiles are poikilotherms |
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