What does population density mean?
AThe number of animals and plants present in a given area
BThe number of individuals in a unit area in a unit time
CThe concentration of human population
DThe number of animals and plants present in a given area
AThe number of animals and plants present in a given area
BThe number of individuals in a unit area in a unit time
CThe concentration of human population
DThe number of animals and plants present in a given area
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