Step-by-step explanation:
Population, health, and environmental education are often considering one integrated subject because they have many things in common and they are bonded because if something is not working with one, other educations are also in degradation.
For example, when it comes to population growth there the environmental aspects are also changing because then can come to the degradation of the recourses. After that, also the degradation of the recourses is affecting health education and way of living.