Which one of the following statements can be inferred from the passage?
In an ecosystem, altering any one element has a ripple effect on all others
We can eliminate option (2) as nowhere in the passage have we said that climate change is purely an arctic phenomenon. We can eliminate option (3) as the essential inference in the passage has nothing to do with wool which was used as an example to highlight a point. We can eliminate option (4) as loss of subnivium even though has its most prominent effect on cold regions; the passage uses subnivium to point out how small things affect each other. So the best inference is the option (1).