A majority of species can be common ancestors of species.Logical formLearned from2 sentences. Species may be evolved from a common ancestor.Logical formLearned from2 sentences. A picture may show ancestors.Logical formLearned from2 sentences. A difficulty can be in ancestors.Logical formLearned from2 sentences. Common ancestors may have some descendants.Logical formLearned from2 sentences. Ancestors can be limbed.Logical formLearned from2 sentences. Evidence can be for human ancestors.Logical formLearned from2 sentences. A time may pertain-to a last common ancestor.Logical formLearned from2 sentences. Ancestors may live in the past.Logical formLearned from2 sentences. Whales may share a common ancestor.Logical formLearned from2 sentences. Transitional species can be an ancestor.Logical formLearned from2 sentences. An interpretation may preclude a possibility of identifying true ancestors.Logical formLearned from2 sentences. Ancestors may share a structure.Logical formLearned from2 sentences. Descendants can be constituted-of-or-filled-with common ancestors.Logical formLearned from2 sentences. Gradual evolution can be from a common ancestor.Logical formLearned from2 sentences.