Terrestrial biomes are characterized by

Options

A. Specific climate
B. Dominant vegetation
C. Microorganisms
D. 1 and 2

Answer

### Step-by-Step Solution:

1. **Understanding Terrestrial Biomes**:
- Terrestrial biomes are large ecological areas on land that are characterized by specific types of vegetation and the animals that inhabit them. Examples include grasslands, deserts, tundras, and forests.

2. **Key Characteristics**:
- The primary characteristics that define terrestrial biomes are:
- **Predominant Vegetation**: Each biome has a specific type of plant life that dominates the area, which is adapted to the local climate.
- **Climate**: The climate of a region, including temperature, precipitation, and seasonal variations, plays a crucial role in determining the type of biome.

3. **Analyzing the Options**:
- Given the options:
- Option 1: Specific climate
- Option 2: Dominant vegetation
- Option 3: Microorganisms
- Option 4: One and two (Specific climate and Dominant vegetation)
- We need to identify which of these options correctly characterize terrestrial biomes.

4. **Identifying Correct Options**:
- From our understanding, both "specific climate" and "dominant vegetation" are essential characteristics of terrestrial biomes.
- Microorganisms, while present in biomes, do not define the biome itself.

5. **Conclusion**:
- Therefore, the correct answer is **Option D: One and Two** (Specific climate and Dominant vegetation).