Ecological age groups of a population are:
$I.$ Pre-reproductive
$II.$ Reproductive
$III.$ Post-reproductive
$IV.$ Old-age group
$V.$ Adolescent age group
$VI.$ Infertile age group
Choose the correct option for the given statements.

The number of organisms in a population is added by:

The distribution of the human population on Earth is:

Which type of population is more efficient in all types of work?

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.

The reproductive capacity of a population that is not limited by environmental factors is called .......