It was the type of diversity that had to do with the niche depending on which niche you are is the amount of varaiaton in your gene pool
1. Amylase, produced in the mouth. It helps break down large starch molecules into smaller sugar molecules.
2. Pepsin, produced in the stomach.
3. Trypsin, produced in the pancreas.
I'm probably wrong. Sorry.
If you go to this link, you will be able to see the answer: http://prezi.com/eatd8nhptvh1/?utm_campaign=share&utm_medium=copy&rc=ex0share
As you move down a group, atomic radius increases
