Explain briefly the meaning of the following terms/words :

(a) Ecosystem, (b) Social Ecology, (c) Invasion and Succession.

(a) Ecosystem : Ecologists consider human beings, animals, plants and environment i.e., temperature, water, land and everything surroundig them.

(b) Social Ecology : The inter-relationship of physical, biological and cultural features of a religion is the subject matter of social ecology. Social ecology is a study of relationships between communities and environment.

(c) Invasion and Succession : The incoming process of the rural people to the cities is called invasion and the process of occupation of urban region by replacing the original settlers in known as “succession”.