Peptide YY (PYY) levels drop when adiposity levels rise, and a drop in PYY levels is linked to obesity. The correct answer is C. decreased PYY level.
Following food ingestion, proximal small intestine cells produce cholecystokinin (CCK). Its effects include reduced appetite, satiation, and insulin and pancreatic enzyme release. Obesity reduces CCK levels. The production of angiotensinogen (AGT), which is elevated in obesity, occurs in the liver and adipocytes. By balancing the conflicting actions of two sets of neurons, the arcuate nucleus (ARC) in the hypothalamus regulates how much food is consumed and how the body uses its energy. 
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Answer:
The anterior and middle scalene muscles lift the first rib and bend the neck to the same side; the posterior scalene lifts the second rib and tilts the neck to the same side. The muscles are named from Ancient Greek σκαληνός (skalenos) 'uneven'.
 
        
             
        
        
        
B is the best answer to the question
        
                    
             
        
        
        
C. Take a look at the pic below for the reasoning
 
        
                    
             
        
        
        
Systemic circulation which is the movement of blood through tissues of the heart carries oxygenated blood from left ventricle through arteries.
Systemic circulation moves blood between the heart and rest of body . It send oxygenated blood out to cells and return the degenerated blood to the heart.
Heart is the only organ in circulatory system organs . blood goes from heart to lung to get oxygen. lungs are the part of the respiratory system. Heart pumps oxygenated blood through artiest to the body. Systemic provide the functional blood supply to all body tissue. Oxygen locks into molecule  called hemoglobin in red blood cells.
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