The number of individuals of the same species per unit area or volume is the ____.

A) population density
B) population distribution
C) age structure
D) population size
E) carrying capacity

Population density is defined as the number of individuals of the same species per unit area or volume. Population distribution refers to the pattern of where individuals are found within a habitat. Age structure refers to the proportion of individuals in different age groups within a population. Population size is the total number of individuals in a population. Carrying capacity is the maximum number of individuals that a habitat can support. Among these options, population density is the closest match to the given definition.