in a given county, the population size is decreasing because there are fewer prereproductive-aged individuals in the population. which of the age structure diagrams best illustrates the population of this county?
The size of a population is the total number of people in it. The likelihood of a species surviving or going extinct is influenced by population size. The risk of death is typically greatest for populations that are very small.
Population size in population ecology and population genetics refers to the total number of individuals in a population. The fundamental source of phenomena like population bottlenecks and the founder effect is population size, which is directly related to genetic drift.
A population pyramid, often called a "age structure diagram" or a "age-sex pyramid," is a visual representation of how people are distributed across age and gender categories in a given community. It often has the shape of a pyramid when the population is expanding.
Thus this is the meaning of population size.
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