Nature’s ____ From flying birds to self-cleaning plants, the way nature works ____ us. Some people ____ use nature ____ imitate it to find solutions to their problems. Leonardo da Vinci (1452–1519) was one such person. He wondered ____ birds could fly. He closely watched birds, made notes, and drew pictures of them. Even though his ____ was not successful, he imitated a bird’s wings to try to make ____. Since then, more and more people have ____ imitated the surprising abilities of ____. Let’s ____ some of them.

Grade 3. reading 1

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