- developed from two separate eggs. Identical twins come from one zygote that splits into two embryos, while fraternal twins come from two separate eggs that are fertilized.
The Centrosome is the organelle responsible for organizing the cell into two parts in preparation for cell division. It develops the spindle fibers used in cell division.
<span>The environment has a greater amount of long nectar tubed flowers and short nectar tubed flowers causing disruptive selection in medium bill length birds.
