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How are the positions of eyes and external nostrils appropriated for the life in the water?

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How are the positions of eyes and external nostrils appropriated for the life in the water?

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  1. The eyes and external nostrils are on the upper surface of the face/head, so that they can stay out of the water while the rest of the animal's body is below the water.

    Here are two examples - the crocodile and the hippo.

    http://lh6.ggpht.com/_CkbMg2S6l7o/Rx2zNc...

    http://www.adoption.co.uk/hippo/hippowat...


  2. Why can you breath underwater without a airtank?

    and also do you have internal nostrils?

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