что означает слово экология

Определите пожалуйста основную тему, проблему, мотив, а так же средства худож. выразительности ( метафоры, эпитеты, сравнения и т.д. ) Плииз

Вообщем стих-е такое: 
Федор Тютчев - Успокоение 

Гроза прошла - еще курясь, лежал 
Высокий дуб, перунами сраженный, 
И сизый дым с ветвей его бежал 
По зелени, грозою освеженной. 
А уж давно, звучнее и полней, 
Пернатых песнь по роще раздалася 
И радуга концом дуги своей 
В зеленые вершины уперлася. 

3. Объем прямоугольного параллелепипеда 1,35 м3,
высота 2,25 м и длина 8 дм. Найдите его ширину.

Дополните предложение соответствующей формой притяжательных местоимений.
 
Example: I left … car in the garage. -  I left my car in the garage.
 
1. I left … car in the garage.
2. Mary hung … coat on the peg.
3. Jack had … hair cut.
4. Neil and David ate … supper.
5. I hope you enjoy … holiday.
6. We’ll invite you round to … house sometime and complete these by adding a possessive with own.
7. You must make up … own mind.
8. The children had to cook … own supper.
9. Bill borrowed Jenny’s car … own can was being repaired.
10. I’ll bring … own sheets and towels.
11. Every dog had … own special basket to sleep in.
12. You should do … own washing up.

Вставьте much или many.
 
Example: Please don't put ... pepper on the meat. - Please don't put much pepper on the meat.
 
1. Please don't put ... pepper on the meat. 2. There were ... plates on the table. 3. I never eat I... bread with soup. 4. Why did you eat so ... ice-cream? 5. She wrote us ... letters from the country. 6. ... of these students don't like to look up words in the dictionary. 7. ... in this work was too difficult for me. 8. ... of their answers were excellent. 9. ... of their conversation was about the institute. 10. There are ... new pictures in this room. ll. There are ... teachers at our school, and ... of them are women. 12. ... of these plays are quite ... new. 13. Thanks awfully for the books you sent me yesterday.  Don't mention it, it wasn't ... bother. 14. ... of her advice was useful. 15. He had ... pairs of socks.