Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
        
             
        
        
        
A host cell is the answer.
        
                    
             
        
        
        
The answer is B seminal vesicles
        
                    
             
        
        
        
The principal function of thyroxine is to stimulate the consumption of  oxygen and thus the metabolism of all cells and tissues. 
Thyroxine is termed T4. It travels through the blood to the target cells and becomes converted to triiodothyronine  or T3. 
T3 is the active form of thyroxine. T3 enters the target cell's nucleus binding to genes responsible  or involved  in the metabolism of sugar in the body. T3 stimulates these genes and in so doing metabolism (conversion of oxygen and calories to energy) is carried out by the cell, which also results in generation of body heat.