sentence2_structure: The conclusion<>evolved<>from a common ancestor$$$The conclusion that two animal species evolved from a common ancestor in recent geological history<>is best supported<>by the observation that the species have similar bone structure$$$the species<>have<>similar bone structure
sentence1: That is, if two different animals have similar bone structures, then they must have evolved from the same original ancestors.
sentence2: The conclusion that two animal species evolved from a common ancestor in recent geological history is best supported by the observation that the species have similar bone structure.
question: Which of the following observations best supports the conclusion that two animal species evolved from a common ancestor in recent geological history?