None of those seem to be in the right place. I think you should start again. And check your spelling.
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Mister MicawberOK, I have copied and pasted the complete text onto my clipboard, removed all the answers and then tried to insert them as if I were starting from the beginning.I did the same thing and came to a similar conclusion - what a horrible exercise. I wonder where you took it from, Dominik. Huh?
DominikFirst of all, if the balance of an ecosystem is threatend then so is its working.It could be rewritten like this: