Which of the following account for the formation of major biomes?

Options

A. The rotation of our planet around the Sun and the tilt of its axis
B. Variations in mean annual temperature
C. Variations in annual precipitation
D. all of these

Answer

To determine which factors account for the formation of major biomes, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Biomes**:
- A biome is a large geographical area characterized by specific climate conditions, vegetation types, soil types, and wildlife. Examples include forests, deserts, grasslands, and tundras.

2. **Evaluating the Options**:
- **Option 1: Rotation of the planet around the sun and tilt of its axis**:
- The rotation of the Earth around the sun affects the length of day and night, while the tilt of the Earth's axis leads to seasonal variations in climate. Both of these factors influence the overall climate of a region, which is crucial for biome formation.

- **Option 2: Variation in mean annual temperature**:
- Different regions of the Earth experience varying mean annual temperatures. This variation affects the types of vegetation that can thrive in those areas, thus influencing the biome type.

- **Option 3: Variation in annual precipitation**:
- Precipitation patterns are critical in determining the types of ecosystems that can develop in an area. Areas with high rainfall may support lush forests, while arid regions may develop into deserts.

3. **Conclusion**:
- All the factors listed contribute to the formation of major biomes. The rotation of the planet and its axial tilt affect climate, while variations in temperature and precipitation directly influence the types of vegetation and wildlife that can exist in those climates.

4. **Final Answer**:
- Therefore, the correct answer is **"all of this"**.