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- 1. Fill in the Blank
350 million years ago, where was all life limited to?
- 2. Fill in the Blank
What were the first animals to develop wings?
- 3. Fill in the Blank
One theory is that wings evolved from structures that first supported insects' ancestors as they moved in what?
- 4. Fill in the Blank
The first wings allowed insects to jump and then do what?
- 5. Fill in the Blank
Were pterosaurs dinosaurs?
- 6. Fill in the Blank
What kind of bones did pterosaurs have?
- 7. Fill in the Blank
How much was the weight of a Quetzalcoatlus?
- 8. Fill in the Blank
What features did the first bird share with the reptiles?
- 9. Fill in the Blank
Could the first bird fly very well?
- 10. Fill in the Blank
Later birds became more skilled fliers due to what?
- 11. Fill in the Blank
When did the fourth and last appearance of flight happen?
- 12. Fill in the Blank
What are the only mammals that have evolved to fly?
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