Homologous structures: Structures that have evolved from the same part of a common ancestor
Example of homologous structure: Pendactyl limb in vertebrates. All these vertebrates share an ancestor that had pendactyl limbs
Adaptive Radiation: Different groups have evolved from a common ancestor, but use different types of locomotion, the limbs developed in a variety of different ways to suit the type of locomotion
- Bat wing for flying
- Horse hoof for galloping
- Monkey hand for grasping
All the organisms share the same bones. The bones may vary in size and shape but all vertebrates have five fingered "hands" at the end of each limb

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