It mainly depends on the population size and technologies in the environment (Human Interference falls into that) .
Answer;
Because it is cheaper to prevent an illness than to treat an illness
Explanation;
-Health Maintenance Organization(HMO) plans offer a wide range of healthcare services through a network of providers who agree to supply services to members.
-According to HMOs it is better to prevent disease rather than to try to find cures for diseases after they occur, therefore they encourage healthy lifestyle practices.
-Prevention typically consists of methods or activities that seek to reduce or deter specific or predictable problems, protect the current state of well-being, or promote desired outcomes or behaviors.
A particle that releases light- respond if you want a more detailed explination