Oganisation present in echinodermata is

Options

A. Cell tissus level
B. Tissue leval
C. Organ leval
D. Organ system level.

Answer

### Step-by-Step Text Solution:

1. **Understanding Echinodermata**: Echinodermata is a phylum that includes marine animals such as starfish, sea urchins, and sea cucumbers. They are characterized by their radial symmetry and a unique water vascular system.

2. **Levels of Biological Organization**: In biology, there are different levels of organization:
- **Cell Level**: The simplest level, consisting of individual cells.
- **Tissue Level**: Groups of similar cells that perform a specific function.
- **Organ Level**: Structures composed of different types of tissues working together.
- **Organ System Level**: Groups of organs that work together to perform complex functions.

3. **Organization in Echinodermata**: Echinoderms exhibit a higher level of organization. They have:
- **Cells**: The basic unit of life.
- **Tissues**: Cells are organized into tissues that perform specific functions.
- **Organs**: Tissues are further organized into organs that carry out more complex functions.
- **Organ Systems**: Organs work together to form organ systems, which coordinate various functions in the organism.

4. **Conclusion**: Based on the organization observed in Echinodermata, the correct answer to the question is that they exhibit an **organ system level of organization**.

### Final Answer:
The organization present in Echinodermata is **organ system level**.

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