Certain characteristic demographic features of developing countries are

Options

A. high fertility, high density, rapidly rising mortality rate and a very young age distribution
B. high infant mortality rate, low fertility, uneven population growth and a very young age distribution
C. high mortality, high density, uneven population growth and a very old age distribution
D. high fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution.

Answer

To answer the question regarding the characteristic demographic features of developing countries, we can break down the features step by step:

### Step-by-Step Solution:

1. **Young Population**: Developing countries typically have a young population. This means that a significant portion of the population is in the younger age groups, which is beneficial as it contributes to a larger workforce.

**Hint**: Think about how a young population can impact the economy and labor force of a country.

2. **High Fertility Rate**: Developing countries often exhibit high fertility rates. This means that women in these countries tend to have more children compared to those in developed countries.

**Hint**: Consider the factors that influence fertility rates, such as cultural norms and access to family planning.

3. **Low Mortality Rate**: While developing countries may have high infant mortality rates, overall mortality rates can be low or declining due to improvements in healthcare and living conditions.

**Hint**: Reflect on how advancements in healthcare can affect mortality rates in a population.

4. **Rapid Population Growth**: The combination of high fertility rates and declining mortality rates leads to rapid population growth in developing countries.

**Hint**: Think about the implications of rapid population growth on resources and infrastructure.

5. **Young Age Distribution**: A young age distribution means that there are more individuals in the younger age brackets compared to older age groups. This is a characteristic feature of developing countries.

**Hint**: Consider how age distribution can affect social services like education and healthcare.

### Conclusion:
The characteristic demographic features of developing countries include:
- High fertility rate
- Low or rapidly falling mortality rate
- Rapid population growth
- Very young age distribution

These features collectively contribute to the demographic profile of developing nations.