UNIT 5 VOCABULARY

17. The wind helped some birds and reptiles .... and stay up in the air.

18. According to the myth, Daedalus warned his son not to .... too close to the sea.

3. The ancient Chinese were ..... at kite-making.

15. The research shows that some birds learnt to fly because of their light, .... wings.

8. The Wright Brothers' Flyer was controlled by a .....

2. Scientists look for evidence to .... that birds evolved from dinosaurs.

19. 350 million years ago all life was ...... to water or land. There was nothing else.

10. Icarus powered himself towards the sun by ... his wings.

14. The Wright Brothers' last plane landed only because it ran out of ....

1. Wings probably ....... from body features of insects' aquatic ancestors.

20. "Quetzalocatlus" had a ..... of 200 kg 229 million years ago.

5. A pterosaur's bones and muscles were strong enough to ..... its great weight in the air.

12. Unit 5 Explorer, Ryan Carney, investigates the theory that ..... in birds originated from "the ground up" and not from "the trees down".

6. Gravity is the ....... that pulls objects down towards the Earth.

16. The .... of the first reptiles was over 10 metres.

11. Animals have not always had the ...... to fly.

4. Da Vinci's glider might have worked if its design had allowed for more .... movement.

9. Leonardo Da Vinci drew designs for flying machines including a glider and a .....

13. It is believed that birds first learned to ..... before eventually flying.

7. True flight is the flight that is ..... by a source of energy.