If $8$ Drosophila in a laboratory population of $80$ died during a week, the death rate in the population is

Which of the following attributes can be applied to an individual organism but not to a population?

Select the correct option with respect to the given age pyramids.

In population density, . . . . . . and . . . . . . increase the population.

Read the given statements carefully and select the correct ones:
$(1)$ Individuals of the same species together form a population.
$(2)$ Mortality is an important factor for population growth.
$(3)$ Natality (birth rate) is an important factor for the immediate increase in population size.
$(4)$ In commensalism,both organisms benefit from the interaction.

An individual and a population have certain characteristics. Name these attributes with definitions.