The sentence you provided, "Bees fill comb pockets with honey and seal them with wax," is grammatically correct. It clearly states what bees do with the honeycomb. Each part of the sentence is properly structured:
- Subject: "Bees" – who are doing the action.
- Verbs: "fill" and "seal" – two actions performed by the bees.
- Objects: "comb pockets" (what they fill) and "them" (referring back to comb pockets, what they seal).
- Prepositional Phrases: "with honey" and "with wax" – indicating what bees fill the pockets with and what they use to seal the pockets.
Overall, the sentence is clear, concise, and grammatically sound, suitable for any age, including 9-year-old students.