Define population density. What are consequences of high population density?

What are the consequences of over population ?

Define population and community.

Explain population density.

Write notes on Population density?

Discuss consequences of population explosion.

"The population of a metro city experiences fluctuations in its population desity over a period of time." If 'N' is the population density at the time 't' , write the population density at the time 't+1'.

Define 'population' in ecology.