The answers that you're looking for is <u><em>B, C, and D.</em></u>
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Hope this helps! <3
 
        
                    
             
        
        
        
Doctors can use technology to evaluate preexisting health conditions so one does not push themselves too far. Technology can help monitor your heart rate, blood pressure, fat percentage, etc. This can give a base to know what to know where/ how much you improved when you look back. Technology can also be your own equipment like a treadmill which makes you more fit. 
 
        
             
        
        
        
Blood I think
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Answer:
I believe its C. I'm not 100 percent sure.
 
        
                    
             
        
        
        
Eccrin glands is one out of the two types of sweat glads that occur over most of your body and open directly onto the surface area of your skin. When your body tempature rises, your Eccrin glands secrete fluid onto the surface of Your skin, where it cools your body as it may evaporate.