The least densely populated state of India is

In a laboratory population of $40$ fruit flies, if $4$ flies die in a week, what is the death rate?

The average population density on Earth is approximately:

Which characteristic is responsible for an increase in population?

The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
$(a)$ Bacteria $.......................$
$(b)$ Banyan $ .......................$
$(c)$ Deer $ .......................$
$(d)$ Fish $ ......................$

Population density means