…………. and …………. have trochophore larva in their development.

Explanation

To answer the question regarding which organisms or phyla have trochophore larvae in their development, we can follow these steps:

1. **Understand what trochophore larvae are**: Trochophore larvae are small, free-swimming larvae that are typically found in aquatic environments. They are characterized by their pear-shaped body and the presence of ciliary bands that aid in locomotion.

2. **Identify the phyla that exhibit trochophore larvae**: The two main phyla that are known for having trochophore larvae are:
- **Annelida**: This phylum includes segmented worms such as earthworms and leeches.
- **Mollusca**: This phylum includes a diverse range of organisms such as snails, clams, and octopuses.

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