Final answer:
FALSE. Birds have a four-chambered heart, not a three-chambered heart like reptiles.
Step-by-step explanation:
The statement that birds have a 3-chambered heart is FALSE. Birds actually have a four-chambered heart, just like mammals. Reptiles, on the other hand, have a three-chambered heart with a partial separation of ventricles. Fish have a two-chambered heart, while amphibians have a three-chambered heart. Therefore, birds are not similar to reptiles in terms of their heart structure.