In a multicellular organism, different cells are specialized to perform different functions. Which of the following organisms is multicellular?

Options

A. Diatom
B. Bacteria
C. Euglena
D. Hydra

Answer

To determine which of the following organisms is multicellular, we need to analyze each option provided.

1. **Understanding Multicellular Organisms**:
- Multicellular organisms are made up of more than one cell, where different cells are specialized to perform different functions.

2. **Evaluating the Options**:
- **Option A: Diatom**: Diatoms are a type of algae and are unicellular organisms. Therefore, this option is incorrect.
- **Option B: Bacteria**: Bacteria are also unicellular organisms. Hence, this option is incorrect as well.
- **Option C: Euglena**: Euglena is another unicellular organism that can perform photosynthesis. Thus, this option is also incorrect.
- **Option D: Hydra**: Hydra is a multicellular organism. It belongs to the phylum Cnidaria and is made up of many specialized cells. This option is correct.

3. **Conclusion**:
- The correct answer is **Option D: Hydra**, as it is the only multicellular organism among the options provided.