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a human and a bat share a common ancestor. according to the article, which evidence supports this relationship?

their teeth have the same structure and function.
their arm bones have the same structure and function.
their teeth have the same structure, but not function.
their arm bones have the same structure, but not function.

The answer is 'D'- Their arm bones have the same structure, but not function. These are homologous structures.

Explanation:

Homologous structures are those which share a basic common structure but perform different function. The hand of a human performs functions like writing, cutting, washing, chopping etc. The wings of a bat are used for the purpose of flying.

Also, a dolphin's flippers, a bird's wing, a cat's leg are all homologous structures. The structures which are homologous have the following features:

THE ANSWER IS D or Their arm bones have the same structure, but not function.

Explanation: