4个英语语法问题 1.The study of the relationship between health and

4个英语语法问题
1.The study of the relationship between health and how the body utilizes food substances,can be divided into four distinct eras.how引导的是什么从句?

The study of the relationship between health and how the body utilizes food substances,can be divided  into four distinct eras.  how引导的是名词性从句 相当于一个名词 作介词 between  的 并列宾语 是宾语从句

The study是主语  of the relationship是定语 修饰 The study
 between health and how the body utilizes food substances是定语 修饰 the relationship
其中 ,between是介词 health and how the body utilizes food substances是并列的两个介词宾语  can be divided是谓语   into four distinct eras是状语
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