UNIT 5 VOCABULARY

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

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

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

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

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.

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

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

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

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

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

17. The wind helped some birds and reptiles .... and stay up 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".

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

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

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

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

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

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