Answer:
Chlorophyll 
Explanation:
Chlorophyll is needed for photosynthesis in plants so the ammount of chlrophyll will limit the rate of photosynthesis because its needed for it
 
        
                    
             
        
        
        
Answer: C. Germ Theory
Explanation: Germ Theory states that most diseases are caused by the presence micro-organisms within the body.
Presently, it is the accepted scientific theory for many diseases. 
 
        
             
        
        
        
Answer: The answer is B while neutrons and electrons are usually the same in a given atom protons are always consistent. 
 
        
             
        
        
        
Answer:
The correct answer is  D. maintain membrane fluidity through its disruption of fatty acid packing.
Explanation:
<u>Cholesterol</u> is a steroid lipid and is a constituent of biological membranes. It regulates the <em>fluidity</em> of the membrane (so, option C is not correct). Since cell membranes are composed of another type of lipids, the phospholipids, which form a bilayer, cholesterol distributes between the phospholipid tails and avoids these molecules pack each other forming rigid clusters. Thus, the option which better explains the effect is <em>D. maintain membrane fluidity through its disruption of fatty acid packing.</em>
 
        
             
        
        
        
Photosynthesis is when a plant converts sunlight into energy, and cellular respiration is when cells convert food into energy.