Which are mostly anaerobic ?

Options

A. Algae
B. Mosses
C. Fungi
D. All the above

Answer

To answer the question "Which are mostly anaerobic?" we can follow these steps:

### Step 1: Understand Anaerobic Organisms
- Anaerobic organisms are those that do not require oxygen for their survival. In fact, some of them find oxygen to be toxic.

### Step 2: Analyze the Options
- The options provided are:
1. Algae
2. Mosses
3. Fungus
4. All of the above

### Step 3: Evaluate Each Option
- **Algae**: Most algae are photosynthetic and require sunlight and oxygen, so they are not mostly anaerobic.
- **Mosses**: Mosses are plants that also require oxygen for respiration, thus they are not anaerobic.
- **Fungus**: Many fungi can be anaerobic. Some fungi are obligate anaerobes, meaning they cannot survive in the presence of oxygen.

### Step 4: Conclusion
- Based on the evaluation, the correct answer to the question is **Fungus**, as many fungi are indeed mostly anaerobic.

### Final Answer
- **Fungus**