Answer:
The following are the two functions of citric acid in the feta cheese:  
1. Coagulation, that is, the chemical reaction of citric acid with proteins in milk leads to separation of curd and whey.  
2. The citric acid functions as a chelating agent, which is required for syneresis, that is, for controlling the moisture content.  
The following are the two functions of agar in the feta cheese:
1. Feta means to slice, and agar offers sliceable texture to the feta cheese as it produces a solid gel-like composition.  
2. It is a vegetarian alternative for gelatin and exhibits higher gelling properties.  
 
        
             
        
        
        
The answer is letter d, it is because when a person becomes obese, he or she is likely to intake small amounts of food if he or she wants to maintain his or her weight and if the person does not want to gain weight anymore and than it is more different when gaining weight or when the person was in the point to become obese because he or she has ingested more food to gain weight.
        
             
        
        
        
B testis, this is were the sperm is produced
        
             
        
        
        
<span>  </span>A high metabolic
rate means that the cells in the tissue will needs a high rate of gas exchange
as the cells will be producing a high amount of CO2 during production of energy.  The dense network of capillaries ensure that
the cells are adequately provided with oxygen.