________ can synthesize their own food.

Options

A. Bacteria
B. Virus
C. Protozoa
D. Algae

Answer

To answer the question "________ can synthesize their own food," we need to analyze the options provided.

1. **Understanding the Options**:
- **Option 1: Bacteria** - Most bacteria are heterotrophic, meaning they do not synthesize their own food but depend on other organisms for nutrition.
- **Option 2: Virus** - Viruses are considered non-living and cannot synthesize food. They require a host cell to replicate and do not perform any metabolic processes on their own.
- **Option 3: Protozoa** - Protozoa are also generally heterotrophic, meaning they obtain their food from other organisms rather than synthesizing it themselves.
- **Option 4: Algae** - Algae are photosynthetic organisms that can synthesize their own food using sunlight, carbon dioxide, and water through the process of photosynthesis.

2. **Identifying the Correct Answer**:
- Since we are looking for an organism that can synthesize its own food, the correct answer is **Algae**. They are capable of photosynthesis, which allows them to produce their own food.

3. **Final Answer**:
- Therefore, the answer to the question is **Algae**.