Classify the structures as homologous or analogous, depending on their structure and function. The limbs of a bat and the forelimbs of a bird have similar functions but different anatomy. The wings of a bird have a skeletal structure, but the wings of bees do not. The arm of a human and the arm of a chimpanzee have similar functions and bone structures. Frogs and salamanders are both amphibians, and they also both have three-chambered hearts.