Zoos

2. The information, understanding and skills that you gain through education or experience
5. The protection of the natural environment
8. A large area of land that has very little water and very few plants growing on it. Many deserts are covered by sand.
12. Too anxious and tired to be able to relax
14. A structure made of metal bars or wire in which animals or birds are kept
15. Living or growing in natural conditions; not kept in a house or on a farm
16. The natural world in which people, animals and plants live

1. To make sure that somebody/something is not harmed, injured, damaged, etc
3. (Used especially about groups of animals, plants, etc.) at risk of no longer existing
4. A large area of open land covered with wild grass
6. Existing only in small numbers and therefore valuable or interesting
7. Connected with, or near the North or South Pole
9. A careful study of a subject, especially in order to discover new facts or information about it
10. The place where a particular type of animal or plant is normally found
11. Left and no longer wanted, used or needed
13. Very different from each other and of various kinds