Decomposers are

Options

A. Phagotrophs
B. Saprotrophs
C. Osmotrophs
D. Both B and C

Answer

### Step-by-Step Solution:

1. **Definition of Decomposers**:
- Decomposers are organisms that break down dead organic material, including the remains of plants and animals. They play a crucial role in the ecosystem by recycling nutrients.

2. **Types of Organisms**:
- Decomposers include various types of organisms, primarily bacteria and fungi. These organisms help in the decomposition process.

3. **Understanding the Options**:
- **Option 1: Phagotrophs** - These organisms ingest food through a mouth and digest it internally.
- **Option 2: Saprotrophs** - These organisms absorb nutrients from decaying organic matter through their body surface.
- **Option 3: Osmotrophs** - These organisms also absorb pre-digested nutrients from their environment.
- **Option 4: Both B and C** - This option suggests that decomposers include both saprotrophs and osmotrophs.

4. **Function of Decomposers**:
- Decomposers secrete enzymes that break down complex organic substances into simpler compounds, which can then be absorbed. This process is essential for nutrient cycling in ecosystems.

5. **Conclusion**:
- Since decomposers can be classified as both saprotrophs (which absorb nutrients from decaying matter) and osmotrophs (which absorb pre-digested nutrients), the most suitable answer is **Option 4: Both B and C**.

### Final Answer:
Decomposers are both saprotrophs and osmotrophs (Option 4).

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