Genesis 11:23

And Serug lived after he begat Nahor two hundred years, and begat sons and daughters.

Genesis 11:23 records one lifespan in the genealogy from Shem to Abraham, giving Serug's two hundred years of life after he begat Nahor, during which he begat sons and daughters. It belongs to the post-Flood genealogies whose ages show that human longevity had greatly decreased after the Flood, with nine generations after the Flood averaging 332 years compared with an average of 912 years across nine generations before it. It thus places Serug among the post-Flood patriarchs, whose lifespans were shorter than those of the patriarchs from Adam to Noah, and belongs to the record illustrating the decline in average human longevity.

Together with the other lifespans in that line from Shem to Abraham, it shows that the patriarchs overlapped for centuries. Because of that long overlap, the knowledge God taught Adam could be communicated directly from Adam to Methuselah to Shem to Abraham and Isaac and then to Jacob. Jacob in this chain of direct transmission is the father of the tribes of Israel.