A scientist discovers a fossil of a new organism and places it in the fossil record. The fossil shows the organism had a similar structures to organism X which appears later in the fossil record. Which conclusion about the organisms is most reasonable

The most reasonable conclusion is that the newly discovered organism is a potential ancestor or closely related species to organism X. This suggests that there may be an evolutionary relationship between the two organisms, with the newly discovered organism potentially representing an earlier stage in the evolutionary history of organism X. Further research and analysis would be needed to confirm this relationship.