This is a recording that discusses the problem of invasive species in Antarctica. The recording is in two sections. You can listen to it once all the way through and then listen once again to each section separately. Read the questions carefully and choose the best alternative.
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6.1 How have humans increased the risks to the environment in Antarctica? (3 p.)

They have travelled there in ever increasing numbers
They have carried out very disruptive experiments
They have spread throughout the whole continent

6.2 What has Kevin Hughes been trying to establish? (3 p.)

Which lifeforms will most likely appear in Antarctica in the near future
Which species have been dwelling in Antarctica for the longest time
Which creatures are becoming increasingly uncommon in Antarctica

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6.3 Why are the existing Antarctic creatures at such risk from crabs? (3 p.)

The existing creatures will not have enough food as crabs eat a lot
The existing creatures can not resist diseases introduced by crabs
The existing creatures have not adapted to living alongside crabs

6.4 Why is it important to protect Antarctica from invasive species? (3 p.)

Preserving the continent can help slow global warming
There is so much to learn from its unique environment
The existing flora and fauna are all totally irreplaceable