Here are three short, simple ways to say it:
- Its long, pointy quills are hollow, so they keep it safe and help it float.
- Hollow quills keep it safe and help it float.
- Its quills are empty inside; they keep it safe and help it float.
Three short, easy-to-understand ways to say 'Its long, sharp quills keep it safe and help it float because they're hollow' for a 6-year-old.
Here are three short, simple ways to say it: