That depends on where you are in the world. Due to the fact that America is the ONLY nation in the world who uses the ft/in system, it would most likely be measured in meters.
Mitochondria is the powerhouse of the animal cell
Answer:
Make sure everyone meets criteria.
Not taking supplements( As some may contain Vit D)
No tanning beds
make sure no one has a hypoactive response to vitamin d through whatever way. Injection, capsule, spray.
Check for genetic conditions or cancers like melanoma which indirectly affect vitamin d levels
Explanation:
These are some of the main things to look out for