If there is an increase in biodiversity, is there a decrease or an increase in sustainability?

There will mostly be a decreased in sustainability.  

Explanation:

Let say you have 2 frogs and 8 flies and then all of a sudden there was 1 snake added, you wont be able to have a good change of having the frogs because thew snake is gonna eat it.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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