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For as long as she can remember, Wren Gray's goal has been to please her parents. But as high school graduation nears, so does an uncomfortable realization: Pleasing her parents once overlapped with pleasing herself, but now … not so much. Wren needs to honor her own desires, but how can she if she doesn't even know what they are? Charlie Parker, on the other hand, is painfully aware of his heart's desire. A gentle boy with a troubled past, Charlie has loved Wren since the day he first saw her. But a girl like Wren would never fall for a guy like Charlie—at least not the sort of guy Charlie believes himself to be. And yet certain things are written in the stars. And in the summer after high school, Wren and Charlie’s souls will collide. But souls are complicated, as are the bodies that house them…生物知识知道点:动物的进化
简单地说,动物界的进化经历了一个从原始鞭毛虫到多细胞动物,从原始多细胞动物到出现脊椎动物。随着海洋面积的逐渐缩小,部分海洋脊椎动物开始向陆地进军,演化到两栖类,从中分化出哺乳类和鸟类,哺乳类中的一支进一步发展为高等智慧生物 。