Предмет: Биология, автор: darianazarova2005

Как вы думаете, почему лес является экосистемой?

Ответы

Автор ответа: kill6264
6
Потому что в лесу живут разные организмы,связанные между собой круговоротом веществ.
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Exercise 16. Use any appropriate tense for the verbs in parentheses.
1. My grandfather ______________________ (fly, never) in an airplane, and he has no intention of
ever doing so.
2. Jane isn't here yet. I _______________________ (wait) for her since noon, but she still
_________________. (arrive, not)
3. In all the world, there _____________________________ (be) only 14 mountains that
_________________ (reach) above 8,000 meters (26,247 feet).
4. I have a long trip ahead of me tomorrow, so I think I'd better go to bed. But let me say good-bye
now because I won't see you in the morning. I _____________ (leave, already) by the time you
________________ (get) up.
5. Right now we ______________________________ (have) a heat wave. The temperature
____________ (be) in the upper 90's for the last six days.
6. Last night I _____________________ (go) to a party. When I _______________ (get) there, the
room was full of people. Some of them _________________ (dance) and others
_________________ (talk). One young woman _____________________ (stand) by herself. I
___________________ (meet, never) her, so I _______________________________ (introduce)
myself to her.
7. About three yesterday afternoon, Jessica _______________ (lie) in bed reading a book. Suddenly
she ______________________ (hear) loud noise and ___________ (get) up to see what it was.
She _____________________ (look) out the window. A truck __________________________
(back, just) into her new car!
8. Next month I have a week's vacation. I _________________ (plan) to take a trip. First, I
_________________ (go) to Madison, Wisconsin, to visit my brother. After I ________________
(leave) Madison, I ________________ (go) to Chicago to see a friend who _________________
(study) at a university there. She ______________________ (live) in Chicago for three years, so
she ___________________ (know) her way around the city. She _____________________
(promise) to take me to many interesting places. I ________________ (be, never) in Chicago, so I
___________________ (look) forward to going there.
9. Yesterday while I ______________________ (sit) in class, I __________________ (get) the
hiccups. The person who ______________________(sit) next to me told me to hold my breath. I
_________________ (try) that, but it didn't work. The instructor______________________
(lecture) and I didn't want to interrupt him, so I just sat there trying to hiccup quietly. Finally,
after I __________________ (hiccup) for almost five minutes, I _________________________
(raise) my hand and ___________________ (excuse) myself from the class to go get a drink of
water.
10. The weather has been terrible lately. It ______________________ (rain) off and on for two
days, and the temperature _______________ (drop) at least twenty degrees.
It____________________ (be) in the low 40's right now. Just three days ago, the sun
_________________________ (shine) and the weather was pleasant. The weather certainly
_________________________ (change) quickly here. I never know what to expect. Who knows?
When I _____________________________ (wake) up tomorrow morning, maybe it
____________________________ (snow)
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