Some demographic data sources are surveys, samples, census measurements, fieldwork, and observation. When using surveys, demographers research through asking questions to select members of the population.
Ecosystem services are those services that t]are essential for the survival of the planet's ecosystem and these systems are necessary for the maintenance of the earth's biological systems.
These services can be grouped s the food, water regulating and disease controlling systems that support nutrient cycles and oxygen production and plus have spiritual and recreational benefits associated with them.
Natural resources are those resources that are found in natural ecosystems and these systems have various life-supporting services an example of natural resource is coal, oil deposits in rocks which provide their services to man.
The main reasons for the conversion of ecological systems by society are to protect and maintain tian these reserves for the future generations sustainably.
My personal opinion, about the conservation and preservation of the ecosystem, is that the earth has nurtured us and give us resources which we depleted due to our needs now it's up to the man who has to make sure that he doesn't destroy its carry capacity.
Emigrate means to leave one's country to live in another. Immigrate is to come into another country to live permanently. Migrate is to move, like birds in the winter. The choice between emigrate, immigrate, and migrate depends on the sentence's point of view.
