The four limbs of all tetrapods. Almost bone for bone. check your arm bones and wrist/hand bones against your dog. Aside from size difference the same set up.
an example of a homologous structure is completely different than asking what it is. for instance a back bone is an example of one but not the definition of what a homologous structure is.
Examples of Homologous Structure: Rodent teeth Hooves in species of camels, goats, sheep and cattle Hands and feet in primates Bird feathers Shark morphology
These are similar structures that animals may share in early development that come from a common ancestor. For example, if you were to take a look at chickens and turtles still in an egg, believe it...
If a bat, a human, an alligator, and a penguin all evolved from a common ancestor, then they should share common anatomical traits. In fact, they do. Compare the forelimbs of the human, the bat, the...