Is this a question? I’m pretty sure this is not one
        
             
        
        
        
Chronic jetlag can cause cognitive deficits that can be permanent. This happens because the normal circadian rhythm of the body is disrupted. The endogenous system of circadian timing in the body adapts slowly. This disturbance  can impair the physical and psychological health of the person.
        
             
        
        
        
Answer:
Controls blood flow to regulate body temp.  
Explanation:
Circulatory system deals with flow/transport of blood
 
        
             
        
        
        
<span>Earth went through a period of hot and also dry conditions and a wide spread drought.These conditions favored reptiles and therefore causing them to evolve during those conditions. Hope this helps :)</span>