Hemichordata resembles chordates in having ...............

Answer

**Step-by-Step Solution:**

1. **Identify the Groups**: Understand the two groups being compared: Hemichordata and Chordata. Hemichordates are a phylum of marine invertebrates, while Chordates include animals with a notochord, which is a flexible rod-like structure.

2. **Find Common Features**: The question asks for the similarity between Hemichordata and Chordata. The primary similarity is the presence of pharyngeal gill slits.

3. **Explain Pharyngeal Gill Slits**: Pharyngeal gill slits are openings in the pharynx that can be used for filter feeding or respiration. In both Hemichordates and Chordates, these structures are present during some stage of their development.

4. **Mention Other Features**: While the pharyngeal gill slits are the most notable similarity, it is also worth mentioning the presence of a buccal diverticulum in Hemichordates, which is a rudimentary structure that is somewhat analogous to the notochord in Chordates but is not a true notochord.

5. **Conclude with Differences**: Highlight that despite these similarities, Hemichordates and Chordates differ significantly in their body plan, segmentation, and habitats.

**Final Answer**: Hemichordata resembles Chordates in having pharyngeal gill slits.

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