Предмет: География, автор: Kaygorodovanv

чего не хватает в экосистеме, в которой почва потеряла плодородие?

Ответы

Автор ответа: kamilochkaaa
0
1. в экосистеме почве может не хватать остатков живых организмов (особенно растительности). если, по каким-то причинам уменьшается количество их, то почва будет терять плодородие. потому что плодородие определяется количеством гумуса - перегноя (а это и есть продукт гниения живых организмов). чем меньше растений - тем меньше гумуса - тем меньше плодородие почвы.
2. плодородие будет снижаться, если в экосистеме нарушится соотношение тепла и влаги. и это опять будет связано с растительностью:
например, чем суше и жарче климат, тем меньше растительности - тем ниже плодородие почвы.
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Предмет: Английский язык, автор: onetwomorelove1
выпишите из текста по 2 предложения, которых глаголы употреблены в форме past simple, past continuous и past perfect. объясните их употребление в каждом конкретном случае.
This happened in Australia during a water-polo game that was one of the main sports events of the season. There was nothing exciting at the beginning of the game, but suddenly one of the players jumped out of the water and ran to the referee. He said that while he was swimming under water, one of the forwards of the other team had bitten him in the leg.
At first, the referee thought that it was some kind of a joke, but when the player pointed at blood on his leg, he had to believe that it was serious. He called the forward and asked him why he had done such a strange thing. Though the forward insisted that he had not bitten anybody, the referee made him leave the game.
They began again, but a few minutes later, two players, one from each team, climbed out of the water, shouting that somebody had bitten them. There was blood on both players legs. The game was stopped, and they began to let the water out of the pool. When almost all the water was let out, everybody saw a young crocodile at the bottom of the pool.
Somebody had put the crocodile into the pool, but why?
The truth became known when the players returned to their dressing- room after the game and found a letter there.
I have been a water-polo fan for many years, the author of the letter wrote, and I am not satisfied with the way the players seem to act. They have allowed the game to become slow and uninteresting, and I have decided that I must do something to make them move faster. I dont think I can do this well myself, and I have decided that my crocodile will do it better.