The genetics of red hair appear to be associated with the melanocortin-1 receptor (MC1R), which is found on chromosome 16. Eighty percent of redheads have an MC1R gene variant.
I cannot find this source for this I'm sorry. I meant to add it but I lost the site
Prokaryotic cells doesn't have a nucleus.
D. Always be nice to the patient and assure them you are capable.
The answer is: It keeps you Hydrated