Answer: 
The calcium carbonate is negatively impacted by increasing CO2 levels and decreasing pH in seawater
        
             
        
        
        
Carbon
reason being that if you've studied the carbon cycle, you know that carbon goes into the atmosphere and is absorbed by plants. but if we produce more CO2 than plants can absorb, it causes more rays from the sun to be concentrated to the earth, rather than being reflected away
        
                    
             
        
        
        
<span>The correct
answer is c. hypothalamus to pituitary gland to adrenal glands.
</span>
When
it comes to stress, hypothalamus-pituitary-adrenal axis (HPA) is responsible for
stress response. Hypothalamus releases corticotropin-releasing hormone (CRH)
which binds to its receptors on the anterior pituitary gland. As a result, adrenocorticotropic hormone (ACTH) is released and it stimulates the release of
cortisol from the adrenal gland. At a certain levels of cortisol, this steroid
hormone exerts negative feedback to the hypothalamic release of CRH.
        
             
        
        
        
 Insects become resistant to pesticides after being exposed to it for some time. 
hope this helps 
 
        
             
        
        
        
I think the answer you are looking for is that the stomach is the fourth level of organization.