Sinoatrial node 
This answer is correct I promise.
 
        
             
        
        
        
It was a little hard but i think the answer is ``Glands`` beacuse i read about Glands and it said that they are ,<span>chemical substances for use in the body or for discharge into the surroundings 
Hope this helps <3 </span>
        
                    
             
        
        
        
Answer:
Seasonal affective disorder
Explanation:
The seasonal affective disorder is a subtype specifier which represents the episode of the bipolar disorder or major depressive disorder.
The specifier requires a particular time of the year that is 2 years and the temporal seasonal relationship that is the onset of depression in the month of winter or late fall and remission in the spring.
Ths symptoms of this disease are weight gain, hyperphagia and hypersomnia.
Thus, Seasonal affective disorder is the correct answer.
 
        
                    
             
        
        
        
The answer is C. Targeting a particular area for improvement
Specificity principle stated that whatever you do in the gym, should be relevant to your desired outcome
For example, if you are a rowing athlete, it should be best if you focus on upper body training more than lower body because you need your upper body strength more than you need the lower