Ian is 5. what nutrients does he need to insulate the body from fluctuations in environmental temperature?

The correct answer is fats.  

The cholesterol, triglycerides, and other essential fatty acids, in combination termed as fats, helps to store energy, insulate the body, and safeguard the vital organs of the body. They function as messengers, assisting the proteins to perform their work, and also helps the body to amass certain nutrients as well.  

In the adipose tissues, the stored fat cells, insulate the body and assist in maintaining the usual core temperature of the body.  

i can't see the full page, therefore, can't answer it

explanation:

answer; polycythemia is the correct answer;