Echinoderms and chordates have

Options

A. Pseudocoel
B. Shizocoelom
C. Enterocoelom
D. Hemocoel

Answer

To answer the question about what Echinoderms and Chordates have, we need to analyze the options provided and understand the characteristics of these two groups.

### Step-by-Step Solution:

1. **Understand the Options**:
- **Pseudocoel**: This is a type of body cavity that is not completely lined by mesoderm. It is characteristic of organisms in the phylum Nematoda (roundworms).
- **Schizocoel**: This type of coelom is formed by the splitting of mesodermal tissue. It is typically found in protostomes, such as annelids and mollusks.
- **Enterocoel**: This type of coelom is formed from the outpocketing of the embryonic gut (archenteron) and is characteristic of deuterostomes, which include both echinoderms and chordates.
- **Haemocoel**: This is a body cavity that is filled with blood and is characteristic of organisms with an open circulatory system, such as arthropods.

2. **Identify the Correct Option**:
- Echinoderms (like starfish and sea urchins) and Chordates (like fish, amphibians, reptiles, birds, and mammals) are both classified as deuterostomes. They share the characteristic of having an enterocoel, which is formed from the outpocketing of the gut during embryonic development.

3. **Conclusion**:
- Based on the definitions and characteristics of the body cavities, the correct answer to the question is **C. Enterocoel**.

### Final Answer:
Echinoderms and Chordates have **Enterocoel** (Option C).

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