What is a bird?
Birds are vertebrates, with a backbone and skeleton, although some of the bones are hollow to keep the bird light. Their forelimbs have the same bones as the human arm, but they are highly modified to form the structure for wings. Some of the bones in the wrist and fingers are fused together for extra strengt
in: http://www.sandiegozoo.org/animalbytes/a-birds.html
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nossa não estava sabendo que as respostas da prova de ingles estava no seu blog mais á alice me dice mais foi bom ficar sabendo
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