Which of the following pairs contributes to an increase in population ?

Options

A. Natality and immigration
B. Mortality and emigration
C. Natality and emigration
D. Mortality and immigration

Explanation

To determine which pairs contribute to an increase in population, we need to analyze the factors that influence population growth. Here’s a step-by-step solution:

### Step 1: Understand Population Growth Factors
Population growth can be influenced by several factors, primarily the birth rate (natality) and the death rate (mortality). An increase in population occurs when the birth rate exceeds the death rate.

### Step 2: Define Natality and Mortality
- **Natality** refers to the number of live births in a given population over a specific period, usually expressed per thousand individuals.
- **Mortality** refers to the number of deaths in a population over a specific period, also expressed per thousand individuals.

### Step 3: Consider Immigration and Emigration
Another important aspect of population dynamics is migration:
- **Immigration** is the movement of individuals into a population, which contributes to an increase in population size.
- **Emigration** is the movement of individuals out of a population, which contributes to a decrease in population size.

### Step 4: Identify the Key Contributors to Population Increase
To increase the population, we need to look for factors that add to the total number of individuals:
- An increase in natality (more births) contributes positively to population growth.
- An increase in immigration (more people moving into the area) also contributes positively to population growth.

### Step 5: Conclusion
Based on the analysis, the pairs that contribute to an increase in population are:
- **Immigration and Natality**.

### Final Answer
The correct answer is the pair: **Immigration and Natality**.

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