How do the Earth's physical factors influence population density? When population growth increases in an area, what is happening to the birth rate and age structure of that population?

The Earth’s physical factors influence population density by being a key determinant in which people choose to reside. Most people wanted to reside in an area nearer to their place of interest, the climate is favorable, and accessible if not to all their needs. When there is an increase in population, birth rate is high, and the age structure of that population is forming like a pyramid which represents more people comprise the younger generation.