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 young 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 information into a step-by-step analysis:

### Step-by-Step Solution:

1. **Definition of Developing Countries**:
- Developing countries are characterized by low to medium standards of living and have not achieved significant industrialization relative to their population.

2. **Understanding Demographic Features**:
- Demographic features refer to statistical factors that affect population growth or decline. Important parameters include:
- Population size
- Population density
- Age structure
- Fecundity (fertility rate)
- Mortality rate
- Sex ratio

3. **Fecundity Rate**:
- In developing countries, the fecundity rate (fertility rate) is typically high. This means that women in these countries tend to have more children.

4. **Population Age Structure**:
- Due to the high fertility rate, developing countries often have a young age population. This is characterized by a larger proportion of individuals in younger age groups.

5. **Mortality Rate**:
- Developing countries usually experience low mortality rates. This contributes to population growth as fewer individuals die at a young age.

6. **Population Growth**:
- The combination of high fertility rates and low mortality rates leads to rapid population growth in developing countries.

7. **Evaluating Options**:
- Now, we can evaluate the provided options based on the characteristics discussed:
- **Option 1**: High fertility, high density, rapidly rising mortality rate, and a very young age distribution.
- Incorrect because of the "rapidly rising mortality rate."
- **Option 2**: High infant mortality rate, low fertility, uneven population growth, and a very young age distribution.
- Incorrect due to the "low fertility" and "high infant mortality rate."
- **Option 3**: High mortality, high density, uneven population growth, and a very young age distribution.
- Incorrect due to "high mortality."
- **Option 4**: High fertility, low or rapidly falling mortality rate, rapid population growth, and a very young age distribution.
- Correct as it accurately reflects the demographic features of developing countries.

8. **Conclusion**:
- The correct answer is **Option 4**: High fertility, low or rapidly falling mortality rate, rapid population growth, and a very young age distribution.