B uses radiation so I would assume it would be the one using x rays
        
                    
             
        
        
        
Answer:
The correct answer is: A) a pregnant woman.
Explanation:
Bodybuilders in particular need the lower body fat percentage possible in order to succeed in their career, since most of their bodies must be muscle. Professional ballet dancers need to be light and skinny to be able to perform their dance moves and to be lifted by their partners; a basketball player also needs a lower fat percentage and a higher muscle mass percentage to be able to play at his best; and a ranch hand as well needs to not be packing that much fat in order to make his job easier.
Pregnant women, however, need body fat to have healthy pregnancies. This doesn't mean that they do not need to take care of themselves, because a higher body fat than what it's needed can lead to diabetes, high blood pressure and can difficult the pregnancy.
 
        
             
        
        
        
Hémoglobin =other name for blood
        
                    
             
        
        
        
Answer:
A feedback loop is a biological occurrence where the output of a system amplifies the system (positive feedback) or inhibits the system (negative feedback).
Explanation:
Example, during blood clotting, a cascade of enzymic proteins acitvates each other, leading to the formation of fibrin clot that prevents further blood loss.
 
        
             
        
        
        
Answer:
The correct answer is D. FADH2
Explanation:
The glycolysis reaction that takes place is:
Glucose (C6H12O6) + 2 ADP + 2 Pi + 2 NAD ⟶2 Pyruvate (C3H4O3) + 2 ATP + 2 NADH + 2 H +
<em>Products: 2 Pyruvate (C3H4O3) + 2 ATP + 2 NADH + 2 H +</em>