A. Add up the individuals who leave an area or die.
O
B. Add up the individuals who come into an area because of
reproduction or immigration,
O
C. Add up the individuals who come into an area and subtract those
who leave the area.
O
D. Add up the biodiversity in an area.
Scientists count a species population by adding up the individuals who leave an area or die. Thus, option A is correct.
In ecology, a population is made up of all the creatures of a certain species that are found in a specific location. Demography is the statistical study of populations and how they evolve through time.
Population size, or the total number of people, and population density, or the number of people per unit of space or volume, are two crucial indicators of a population. Quadrats and the mark-recapture technique are frequently used by ecologists to assess the size and density of populations. A population's distribution, or dispersion, of the individuals that make it up, may also be used to define it. Individuals may be dispersed uniformly, randomly, or in clusters. Random spacing denotes uneven spacing, uniform denotes equally spaced individuals.
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The correct answer is to add up the individuals who leave an area or die, which is option b, as when scientists count a species population, they typically use a method known as population census or population sampling.
Sampling is a method where scientists select a representative sample area within the species' habitat or range. This sample area should be large enough to be representative of the entire population but manageable for counting and data collection. Scientists then count the number of individuals within the sample area. Once the number of individuals within the sample area is determined, scientists use statistical methods to extrapolate this information to estimate the total population size.
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Hope this helps :)