Preference for choosing a mate with different MHC markers has been documented by rarely with social animals besides humans.

There may be a preference for mates carrying different MHC, because it can help animals increase offspring pathogen resistance, or avoid inbreeding.

an Individual that has two alleles of a particular gene

Instead of treating people when they get sick, it should be prevented before it happens. In industrial-era Great Britain in the 19th century, years of protesting led to better work systems and fewer workplace deaths. Reliable health care, and safe drinking water. People without these resources can live up to twenty years less than those with these conditions. Increased education, stricter laws regarding seatbelts, or better building of car seats can prevent car crashes by 41 percent. Multiple solutions, and players address issues from multiple perspectives can fix the issue. creating parks in under resourced community can encourage people to get active and reduce heart disease or other illnesses

Second video: Doctors look at individuals, and Public health looks at communities. With a greater understanding of health, then we can increase life expectancy for more than twenty years. Public health was founded on the foundation of social justice. Unhealthy levels of air pollution, workers can't work through a livable wage which allows almost no access to healthier water, foods, or sanitation.

Public Health saves money because it allows for fewer uses of resources due to the better health of the community.