The number of individuals that occur in a unit of area is called the population __________.

• A. growth rate
• B. density
• C. size
• D. distribution

Answer: (B)

Verified step by step guidance

1. Understand the question: The problem is asking for the term that describes the number of individuals in a unit of area, which is a key concept in population ecology.
2. Review the options provided: The options are 'growth rate,' 'density,' 'size,' and 'distribution.' Each term has a specific meaning in population biology.
3. Define each term: 'Growth rate' refers to the change in population size over time. 'Density' refers to the number of individuals per unit area or volume. 'Size' refers to the total number of individuals in the population. 'Distribution' refers to how individuals are spaced within the area (e.g., clumped, uniform, or random).
4. Match the definition to the question: The question specifically asks about the number of individuals in a unit of area, which aligns with the definition of 'density.'
5. Conclude that the correct term is 'density,' as it directly answers the question about the number of individuals per unit area.