Definition: You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*
Input: 1: The jawbone has been dated to 2.8 million years ago -- which predates the previously known fossils of the Homo lineage by approximately 400,000 years , according to Arizona State University . 2: The age of the fossil means it could help fill in an important gap in our knowledge . 3: It has been dated to 2.8 million years ago , which means it helps fill in a crucial gap in our knowledge .

1: The jawbone 2: the fossil 3: It