When the chromosomes line up on
the equatorial plane you can conclude the cell is in metaphase. Metaphase is
the third phase of mitosis in which duplicated chromosomes align themselves in
the middle of the cell along the equatorial plate of the spindle. The
replicated chromosomes which are joined at the centromere are called sister
chromatids.
Birds and butterflies don't have a common ancestor because one is a member of a insect and the other is well a bird. They both have different body structure. One has bones and the other has an exoskeleton. hope this helps
