The …….. means the number of birth per ……... in a particular area for a particular time.

Options

A. productivity, 100
B. mortality, 1000
C. natality, 1000
D. natality, 100

Answer

To solve the question, we need to fill in the blanks with the correct terms that describe the number of births in a particular area over a specific time frame. Let's break it down step by step.

### Step 1: Understand the Question
The question states: "The …….. means the number of births per ……... in a particular area for a particular time."
We need to identify two terms that fit into the blanks.

### Step 2: Analyze the Options
1. **Productivity**: This term refers to the rate of generation of biomass in an ecosystem, not related to births.
2. **Mortality**: This term refers to the number of deaths per unit (usually per thousand) in a particular area for a specific time. It does not relate to births.
3. **Natality**: This term refers to the number of births in a population over a specific time period. It is often expressed per unit (like per thousand).
4. **Mortality (again)**: This is a repeat of the previous option and does not fit the context of births.

### Step 3: Identify the Correct Terms
From the analysis:
- The first blank should be filled with **Natality**, as it refers to the number of births.
- The second blank should be filled with **thousand**, as it is common to express birth rates per thousand individuals.

### Final Answer
The completed statement is: "The **Natality** means the number of births per **thousand** in a particular area for a particular time."