Sex ratio refers to the proportion of males and females in a population.

Environmental conditions, genetic factors, and parental care can all influence the sex ratio of a population.

In a male-biased sex ratio, there is increased competition among males, increased reproductive success for males, and decreased population growth.

Sex structure refers to the distribution of individuals of different sexes within a population.

Age distribution, mating system, and environmental conditions can all influence the sex structure of a population.

In a population with a skewed sex structure, there is increased competition for mates, decreased reproductive success, and increased population growth.

Age ratio refers to the ratio of sexually mature individuals to sexually immature individuals in a population.

Birth rate, death rate, immigration, and emigration can all influence the age ratio of a population.

In a population with a high age ratio, there is decreased population growth.

Age structure refers to the distribution of individuals of different ages within a population.

Birth rate, death rate, immigration, and emigration can all influence the age structure of a population.

In a population with a skewed age structure, there is increased population growth, decreased population growth, and increased competition for resources.

Size structure refers to the distribution of individuals of different sizes within a population.

Growth rate, death rate, predation, and competition can all influence the size structure of a population.

In a population with a skewed size structure, there is increased population growth, decreased population growth, and increased competition for resources.