A. the runner's muscles have accumulated lactic acid.. I think.  99% sure
        
                    
             
        
        
        
Answer:
The term describes cellular respiration 
Explanation:
Cellular respiration, also known as internal or tissue respiration can be represented by the equation:
C6H12O6 + 6H2O ---> 6H2O + 6CO2 + Energy (in form of ATP)
From the equation, glucose from the blood is oxidized by oxygen trapped from the air by the nostrils. The main purpose of cellular respiration is to generate energy required by the body for various life activities 
 
        
             
        
        
        
Answer:
A:  Oxygen is a process by which respiration happens.
Explanation:
Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
Also:Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
~Hope this helps
 
        
                    
             
        
        
        
Answer:
D. automatic processing involves primitive areas of the brain associated with fear
Explanation:
The amygdala in the limbic system represents a region of the brain that has recently received attention as a possible region associated to fear reactions. Moreover, it has been proposed that the amygdala was one of the first limbic regions to develop in course of evolution.
 
        
             
        
        
        
The part of the brain where planning, language and advanced thought occur is the cortex.
It is the largest part of a human brain, the cerebrum or the cortex. Connected with higher brain function such as thought and action. The cortex also protects the cerebellum.