Выбери подходящее по смыслу слово.
All living things change over (1)...of years to improve their chances of(2) . This process of change is called(3)... . Birds evolved from reptiles about 150 million years ago. Their feathers developed from the scales which(4)... their ancestors. Wings gradually evolved from front legs. One of the first(5)...was Archaeopteryx("ancient wing"). It was a bad flier and used to climb trees and then glide away.
слова: survival, covered, thousands, birds, evolution.​

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