Answer:
d. platelets
Explanation:
Platelets often referred to as thrombocytes, are membrane-bounded cell fragments that are obtained from the dissociation of bigger precursor cells referred to as megakaryocytes, that are produced from stem cells in the bone marrow. 
Platelets are necessary for the blood clotting activities, making it very important for wound healing.
 
        
             
        
        
        
The major source of energy for playing in a competitive soccer match, or participating in any athletic competition for that matter, comes from adrenaline. 
        
             
        
        
        
Answer:
Steroids. Which molecules determine the tissue specificity of hormones? Receptors. Hormones bind to receptors on target cells and trigger a cellular response.
Explanation: