The sentence "Hermit crabs look for empty snail shells that fit snugly" is grammatically correct. It clearly explains that hermit crabs search for empty snail shells which fit tightly.

If you want to make it even clearer for a 7-year-old, you could say:

  • "Hermit crabs look for empty snail shells that fit their bodies snugly."

This adds a little more detail about what "fit snugly" means.


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