Part of mental health is how well your mind processes and understands information and experiences. In contrast, emotional health involves your ability to manage and express the emotions that arise from what you have learned and experienced.
It was like memory t- cells which basically are the brains of the immune system,this way if a disease strikes,the next time it strikes the immune system knows what to do and what to protect like vital organs a virus may attack
Mr. Tully can make the decision for himself only if lucid and deemed to have good judgement. His daughter can fill out the form for him if she has the legal authority or has guardianship over her father.