Which term is used to describe the number of individuals born in a given time period?

• A. Death rate
• B. Birth rate
• C. Fecundity
• D. Vital statistics

Answer: (B)

Understanding how we quantify reproduction over time helps you choose the right term. The number of individuals born in a given time period is described by the birth rate. This is typically expressed as births per unit time per population size (for example, births per 1,000 individuals per year), which standardizes the count so you can compare across populations or time periods.

Death rate refers to the number of deaths in the same period, not births. Fecundity describes the potential reproductive capacity of individuals or a population—how many offspring could be produced under ideal conditions—not the actual observed births in a specific time frame. Vital statistics is a broader set of demographic data that includes measures like births and deaths but is not itself the term for births per time period.

So, the term that best describes the number of individuals born in a given time period is birth rate. For example, if a population of 10,000 has 200 births in a year, the birth rate is 20 births per 1,000 individuals per year.