Any three aspects of the population are biological aspect, psychological aspect, and socio-cultural aspect.
Biological Aspect:
The population is the total number of people living in a given area in a given period of time. People, literally, mean the collective form of human beings. We have life and we survive in the environment through a biological process. Thus, population and biotic aspects are closely related.
Psychological Aspect:
The psychological aspect is the key determinant of human behavior. It is related to the mental state of human beings. A positive attitude and behavior help in keeping harmonious relationships among people. People who grow up in an uncivilized society and culture usually have a negative attitude. This attitude is always harmful to people and the environment. The psychological state cannot be described and understood just as an abstract; rather it is determined by the mental health and healthy function of the brain.
Socio-Cultural Aspect:
Socio-cultural aspect includes social norms, values, social systems, traditions and practices. Such factors are developed by people themselves for a convinent livelihood and social cooperation. Every cohort of population has peculiar social and cultural characteristics.