An organization formed by individuals of the same species is called.....

Members of a population:

The age pyramid with a broad base indicates:

Explain the specific attributes of a 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 $ ......................$

Find out the population density when $N$ is $1000$ and $S$ is $100 \, m^{2}$.