Crocodile, frog and hippopotamus, despite the fact that they seem completely different, have several similarities:
they have a streamlined body to better swim in water;
in these animals, the nostrils and eyes are located on a hill in order to look at what is happening, sticking their head out of the water.
The similarities arose because they live in the same conditions: mainly in water, but they cannot breathe in water, they often come to the surface.
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