How does the presence of reptilian and mammalian nephrons provide evidence for the relatedness of birds and other vertebrates?

When organisms are classified ,they are given a two part name

The production of cells during mitosis into specialized function is recombination or differentiation

The chromosomal structure that limits the number of cell divisions of a cell is the the chromosomal structure that limits the number of cell divisions of a cell is the kinetochore telomere histones centromere