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

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

It's a very interesting video!

This is undeniable that everything in the Universe are connected to each other and a slight change in one element can lead to the big changes. For instance,if you turn off a light bulb that you don`t use and if this action continues among all people around the world,we will save Energy which requires precious natural resources such as oil and gas to be generated.Not wasting Energy equals not wasting money and this means we will be able to allocate more funds to environment.

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

This is amazing. I am surprised to know these facts. Unbelievable!

How interesting! Wolves has became more intricate to me

Using technological devices more wisely would be a minor change in our habits that could have a dramatic, positive impact on our ecosytem, not to mention the
beneficial effects on our lifestyle

There is a lot of knowledge in a short video, surprisingly effects of wolves are discovered here.

This is an amazing history about the nature power. And how can it teach us.

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