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

Define population and community.

Choose the wrong statement.

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

Under a particular set of selection pressure,organisms evolve towards the most efficient reproductive strategy. For example:
$A$) Oysters produce a large number of small-sized offspring.
$B$) Mammals produce a small number of large-sized offspring.
In the light of the above statements,choose the correct option.

What is the total population of organisms of the same type called?