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Imagine that someone from another planet is visiting Earth. They see aeroplanes and birds
moving through the sky,
Explain to the visitor why birds are alive and aeroplanes are not alive, even though they seem to
share some of the characteristics of living things

Sagot :

Birds, like airplanes, must be lightweight as well as powerful. They can fly only because evolution slimmed down their entire anatomy from their reptilian ancestors. Over time, the bones of birds have become lighter and, in the case of many "finger bones," some have disappeared altogether.

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