It's D because it's found in the <span>cell's plasma membranes (at high concertration levels)
Hope this helps!! :-)</span>
        
                    
             
        
        
        
Answer:
the sperm fertilizing the egg
Explanation:
 
        
             
        
        
        
Answer:
In an ecosystem, energy enters in the form of solar energy or light energy from sun. Solar energy is transformed into various other types of energies like kinetic energy, chemical energy, potential energy, etc; but it eventually leaves the ecosystem in the form of heat energy.
 
        
             
        
        
        
Answer:
Rate of product formation is linear and [S] has not been lowered significantly.
Explanation:
The rate of enzyme-catalyzed reactions is affected by several factors, the contraction of substrates [S] is one of them. The substrate concentration keeps on changing as the reaction proceeds. This is why the reaction rate is measured at the initial stages of reactions when the substrate concentration [S] is much greater than the concentration of the enzyme. It is called the initial rate or initial velocity. 
Under the conditions of higher substrate concentration and relatively much lower enzyme concentrations, only a few molecules of substrates are being converted into product. At a relatively higher substrate concentration, the rate of product formation increases linearly.
 
        
             
        
        
        
Answer:
HbA; lowers
Explanation:
The BPG in our blood stands for Bisphosphoglyceric acid. It is known as by its name as 2,3-Bisphosphoglyceric acid. It is present in our blood in the red blood cells. It binds with more affinity towards the de-oxygenated hemoglobin as compared to the  oxygenated hemoglobin.
Hemoglobin in blood delivers oxygen to our tissues moire efficiently. It is abbreviated as Hb. 
Thus BPG binds more tightly towards HbA or adult hemoblobin and which lowers the affinity for oxygen.