Answer:
Step-by-step explanation:
According to the article, the evidence that supports the relationship between humans and bats sharing a common ancestor is that their arm bones have the same structure and function. Specifically, the article mentions that the bones in the wings of bats are homologous to the bones in the arms of humans and other mammals. This indicates that the wings of bats evolved from the arms of a common ancestor shared with humans and other mammals. The article does not mention anything about the teeth of humans and bats having the same structure or function. Therefore, the correct answer is:
Their arm bones have the same structure and function.