1. was formed , Past Simple Passive.
2. is derived, Present Simple Passive.
3. was suggested , Past Simple Passive.
4. is , от глагола to be ед. число , Present Simple .
5. are , от глагола to be мн. число Present Simple
6. studies, Present Simple -s показатель 3 лица ед. число .
7. suppose , Present Simple .
8. inhabit , Present Simple .
9. consists , Present Simple , -s показатель 3 лица ед. числа .
10.has , от глагола to have , в 3 лице , Present Simple .
11. can be described, Present Simple Passive .
12. set , Present Simple .
13. provide, Present Simple .
14. to pay , Present Simple.
15. differ , Present Simple.
16. studies, Present Simple , -s показатель 3 лица ед. числа .
17. have , Present Simple .
18. sees , Present Simple , -s показатель 3 лица ед. числа .
19. doesn't concur , Present Simple , в 3 лице , ед. числа .
20. is analyzed, Present Simple Passive .
1. When was ecology formed as an independent science?
2. Was the term "ecology " suggested by German ecologist Ernst Heckel ?
3. What do the majority of modern researches suppose?
4. The theory in ecology consists of principles used to construct models, doesn't it ?
5. What three studies does ecology study ?