According to the population of different states of India,Madhya Pradesh is placed at which position?

$A$ biologist studied the population of rats in a barn. He found that the average natality was $250$, average mortality $240$, immigration $20$ and emigration $30$. The net increase in population is

The given age pyramid for human population indicates:

The population of a place can be increased when:

Density of population increases when . . . . . . .

Which characteristic is responsible for an increase in population?