"K.A. Applegate's Animorphs series revolves around humans and an alien who use their ability to morph into animals to battle an alien attack of Earth. ""Those books brought up some pretty heavy moral dilemmas and challenged the readers to draw their own conclusions,"" <a href=""http://www.cnn.com/2013/10/07/living/best-young-adult-books/index.html#comment-1075594290"">one enthusiastic reader said</a>."
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