Drugs and other things can be involved
The answer will be chronic strain. Because it is caused by a repetitive and stressful motion.<span />
Life has a different meaning to everyone. Each person has a different meaning, reason, goals, purpose, beliefs, and more. People see life differently than others, too.
Cell membrane is composed of two layers of fatty acids these fatty acids have two domains hydrophobic and hydrophilic.
I would say D but i am not to sure. sorry if you get this wrong.