The answer is (c.) a (alpha cells) in the pancreas will be producing glucagon.
When a person sleeps for more than eight hours, the alpha cells in the pancreas will start to produce glucagon. The glucagon is responsible for the increase in blood glucose level the opposite of insulin which decreases the level.
        
             
        
        
        
Here is what photosynthesis is: The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
 
        
                    
             
        
        
        
This relationship would be called parasitism. Its when one individual lives on or in and feeds on a host organism.
        
             
        
        
        
Answer:
The correct option is A. The oxygen atoms diffuse through the atmosphere and are inhaled by animals.
Explanation:
Photosynthesis can be described as a process in which plants use the light from sun to convert carbon dioxide and water into glucose. Oxygen is made as a by-product of this reaction. This oxygen is released into the atmosphere by the plants through the mechanism of diffusion. 
The oxygen released into the atmosphere is taken up by animals. Animals utilize this oxygen for the process of respiration.
The process of respiration and photosynthesis are opposite to each other.