Tissue level organisation is exhibited by

Options

A. sponges
B. coelenterates
C. both 1 & 2
D. triploblastic animals

Answer

To determine which organisms exhibit tissue-level organization, we can analyze the different levels of biological organization in various animal phyla. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Levels of Organization**:
- Organisms can be classified based on their level of biological organization, which includes cellular, tissue, organ, and organ system levels.

2. **Identifying Phyla**:
- The question presents four options: sponges (phylum Porifera), cnidarians (phylum Cnidaria), triploblastic animals, and a combination of the first two.

3. **Analyzing Sponges (Phylum Porifera)**:
- Sponges are the simplest animals and exhibit cellular level organization. They do not have true tissues; instead, their bodies are made up of loosely organized cells.

4. **Analyzing Cnidarians (Phylum Cnidaria)**:
- Cnidarians, which include jellyfish, corals, and sea anemones, exhibit tissue-level organization. They have specialized cells that form tissues, allowing for more complex functions than sponges.

5. **Analyzing Triploblastic Animals**:
- Triploblastic animals possess three germ layers: ectoderm, mesoderm, and endoderm. These layers develop into organs, indicating that they have organ-level organization rather than just tissue-level organization.

6. **Conclusion**:
- Since sponges do not exhibit tissue-level organization and triploblastic animals exhibit organ-level organization, the only group that fits the criteria of exhibiting tissue-level organization is cnidarians.

### Final Answer:
The correct answer is **Cnidarians (Phylum Cnidaria)**.

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