Answer:
A rise in blood carbon dioxide concentration.
Explanation:
The feedback regulation may be defined as the process in which the end product of the metabolic pathway regulates the homeostasis of the body. Two main types of feedback are positive feedback and negative feedback.
The negative feedback mechanism occurs when the end product of the reaction is responsible for the shutdown of the metabolic pathway and decreases its concentration. The breathing is controlled by the negative feedback mechanisms, the increase in carbon dioxide concentration acts as the negative sensor as this sensor is mainly responsible for the increase in amount of oxygen level and maintain homeostasis of the body.
Thus, the correct answer is option (c).
 
        
             
        
        
        
<span>Fossil record, genetics, and examples of local adaptations all support the theory of evolution by natural selection.</span>
        
                    
             
        
        
        
Assuming the white phenotype is recessive. white: gg 
I think the gray mouse is Gg because the offspring were pretty equally distributed in terms of color. See the punnet square below. 
 g g
G| Gg Gg
g| gg gg
If the Gray phenotype is recessive, then gray: ww but only if white is Ww because its about 50% chance for both.