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Hello, everyone. I ____ Frank Smith.Frank is my first name.My ____name is Smith.This is my schoolbag.It's ____. In it,you can see ____books and a pencil box. ____ is that? Oh,it is a watch. And ____ watch is yellow. It isn't____ . I found it ____ Class 7A. Is it ____? Please ____ Frank at 9556833.
下图是人体的关节模式图，请据图回答下列问题：
某校学生在对校园动物进行调查时，发现了以下几种动物，他们把这些动物分为甲类和乙类（如图所示），同学们的分类依据是（ ）
