The size of a population increases if

Options

A. Natality =Mortality
B. Nationality lt Mortality
C. Natality gt Mortality
D. Mortalitygt Natality

Answer

To determine when the size of a population increases, we need to analyze the concepts of natality and mortality.

### Step-by-Step Solution:

1. **Define Natality and Mortality**:
- **Natality** refers to the birth rate, or the number of new individuals born into a population over a specific period.
- **Mortality** refers to the death rate, or the number of individuals that die within a population over the same period.

2. **Understand the Relationship**:
- The size of a population is influenced by the balance between natality and mortality.
- If natality exceeds mortality, the population size will increase. Conversely, if mortality exceeds natality, the population size will decrease.

3. **Analyze the Options**:
- **Option A**: Natality is equal to mortality. This means the population size remains stable, not increasing.
- **Option B**: Mortality is less than natality. This indicates that more individuals are being born than dying, leading to an increase in population size.
- **Option C**: Natality is greater than mortality. This is the correct option, as it indicates that the birth rate is higher than the death rate, resulting in population growth.
- **Option D**: Mortality is greater than natality. This would lead to a decrease in population size.

4. **Conclusion**:
- The size of a population increases when the natality (birth rate) is greater than the mortality (death rate). Therefore, the correct answer is **Option C: Natality greater than mortality**.