Segmentation is seen in the members of

Options

A. Mollusca
B. Echinodermata
C. Hemichordata
D. Chordata

Answer

To determine which group of animals exhibits segmentation, we can analyze the options provided:

1. **Understanding Segmentation**:
- Segmentation refers to the division of the body into repetitive segments or sections. This characteristic is observed in certain animal phyla.

2. **Evaluating the Options**:
- **Mollusca**: Members of this phylum, such as snails and clams, do not exhibit segmentation. Their bodies are typically unsegmented.
- **Echinodermata**: This group includes starfish and sea urchins, which also do not show segmentation. Their body plan is based on radial symmetry rather than segmentation.
- **Hemicordata**: This phylum includes organisms like acorn worms, which do not have a segmented body plan.
- **Chordata**: This phylum includes vertebrates and some invertebrates, and it is characterized by segmentation, especially in the development of the vertebral column and muscle blocks.

3. **Conclusion**:
- Based on the analysis, segmentation is primarily seen in members of the phylum **Chordata**.

### Final Answer:
Segmentation is seen in the members of **Chordata**.