观察鸟的形态结构示意图,请结合图示写出鸟类适于飞行生活的特点 (1)外部形态: 仔细观察如图一组鸟的形态结构图,然后请你从中找出有效信息,再...
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(1)鸟的体形呈流线型,可减少飞行时空气的阻力,适于飞行;前肢变成翼,有利于空中飞行. (2)鸟类会飞行,其结构特征总是与其生活相适应的.有的骨中空,有的骨愈合,能减轻体重;胸肌发达,利于牵动两翼完成飞行动作. (3)体内有气囊,辅助肺完成双重呼吸,可以供给充足的氧气. 故答案为:(1)流线型;、前肢变成翼(2)胸骨发达,长骨中空;胸肌发达;(3)双重呼吸 |
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