What is the number of individuals in a specific unit area called?

• A. Population density
• B. Biome
• C. Family
• D. Biome density

Answer: (A)

It’s about measuring how many individuals live in a given area. The term is population density, which describes the number of individuals per unit area (for example, per square kilometer). This measure helps us compare how crowded different habitats are and understand how resources and space are distributed. A biome, on the other hand, is a large ecological region defined by climate and the communities it supports, not by how many individuals occupy a space. A family is a social unit within a species, not a spatial density. “Biome density” isn’t a standard term and doesn’t convey per‑area counts. Population density is found by dividing the number of individuals by the area they occupy; e.g., 500 people in 2 square kilometers equals 250 people per square kilometer.