Complete the following sentences with the words from the box. There are two extra words which you don’t need.​ predators rainforests natural habitat bacteria biodiversity perennial annual cross-bred strains balance of nature liability species insects extinction upset ecosystem

1. Dahlias are ____ plants.

2. Many ____ of plants and animals are at risk of _____ .

3. The treaty on ____ was signed in Rio de Janeiro in 1992.

4. Young rabbits provide food for a variety of ____ .

5. Last year our enterprise ____ four new ____ of corn.

6. _____ exist in large numbers in air, water and soil, and also in living and dead creatures and plants.

7. Colorado potato beetles, May beetles and dragonflies are _____ .

8. The Amazonian _____ are the lungs of the earth.

9. Dill is a _____ plant.

10. This creature’s _____ _____ is the jungle.

11. The _____ of our planet is very fragile.

12. We have the power to ____ the balance of nature but we cannot restore it.