Which answer correctly explains the relation among population size distribution and density?

Correct answer: Size is total number distribution is spread and density is concentration per area

Direct answer: Option A is correct. Population size, distribution, and density are connected but different ideas. Population size is the total number of people. Distribution describes where those people are located and how evenly or unevenly they are spread. Density describes the number of people living per unit of area, commonly calculated as population divided by area. Step by step: count all people for size; observe their spatial spread for distribution; divide population by area for density. Option A gives all three correct meanings. Option B is wrong because these terms are not different names for birth rate. Option C is wrong because area is essential, especially for density and spatial distribution. Option D is wrong because a map represents places, a census counts people, and weather is a physical condition; none of these definitions replaces the three population concepts. Memory cue: size is “how many,” distribution is “where,” and density is “how many per area.”