Geometric representation of age structure is a characteristic of

The given age pyramid for human population indicates:

Which factors influence the change in population density?

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.

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

Which environmental conditions are available for organisms that produce a large number of offspring at once versus those that produce only one offspring,considering their life history traits and the constraints imposed by biotic and abiotic factors?