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(C) Population density is the number of individuals of a species per unit area or volume at a given time.$1$. Numbers: This is the most common measure

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$(a), (b), (c)$

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(C) Population density is the number of individuals of a species per unit area or volume at a given time.$1$. Numbers: This is the most common measure of population density (e.g.,counting the number of individuals in a specific area).$2$. Biomass: This is used when the total number of individuals is difficult to count or when the size of individuals varies significantly (e.g.,in a forest,the number of trees is less meaningful than their biomass).$3$. Pug marks: These are used to estimate the population density of certain animals like tigers in national parks and tiger reserves,where direct counting is difficult.$4$. Height: Height is an individual characteristic and is not a standard measure for population density.Therefore,$(a)$,$(b)$,and $(c)$ are useful for measuring population density.

Which of the following are useful for measuring population density (size)?
$(a)$ Numbers
$(b)$ Biomass
$(c)$ Pug marks
$(d)$ Height

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Which of the following are useful for measuring population density (size)?$(a)$ Numbers$(b)$ Biomass$(c)$ Pug marks$(d)$ Height