Yes, that's right – wolves can change rivers! Watch this video and find out how.

Do the preparation task first. Then watch the video and do the exercise. Remember you can read the transcript at any time.

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Moreover, for what electric power is concerned, I would point out that its saving means mainly reducing the use of nuclear power

It's a very interesting video!

Very nice video! Specially for me who likes biology!!!

Use of aerosol cans reduces the ozone layer of the planet.

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