Reptiles lack external ear openings, have a tympanum for hearing, two pairs of limbs when present, and a usually three-chambered heart (four in crocodiles). They are poikilotherms.
Reptiles lack external ear openings, have a tympanum for hearing, two pairs of limbs when present, and a usually three-chambered heart (four in crocodiles). They 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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