Please answer the "why" question at the end of the first paragraph, and please help with interstitial sites numbers.

t 00000000000000000000000000000000000000000000000000000000000000000 erertererere 2. (13 points) Using the VESTA software, show the geometric arrangement of atoms around the tetrahedral and octahedral interstital sites in the FCC and BCC crystal structure and list the coordination number for both interstitial sites. Use the style "spacefilling" and only show atoms that are directly adjacent to the interstitial site! FCC and HCP arrangements will be similar, why? From your models and the putty provided, determine the maximum diameter that will fit into the tetrahedral and octahedral interstitial sites in the FCC and BCC crystal structure. How many lattice points and interstitial sites belong to each cubic unit cell