Silkworms belong to Order.

Explanation

**Step-by-Step Solution:**

1. **Identify the Classification of Silkworms**: Silkworms are classified under a specific taxonomic hierarchy. The first step is to identify the broader classification, which includes the kingdom, phylum, class, order, family, genus, and species.

2. **Determine the Phylum**: Silkworms belong to the phylum Arthropoda. This phylum includes invertebrate animals with an exoskeleton, segmented bodies, and jointed appendages.

3. **Identify the Class**: Within the phylum Arthropoda, silkworms fall under the class Insecta, which encompasses all insects.

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