I think C) availability of water is your best answer because alot of organisms count on water as a major resource because they need it to survive so a lack or a gain in the amount of water will majorly effect an ecosystem.
 
        
                    
             
        
        
        
Cyclic phosphorylation is a kind of phosphorylation in which ATP is formed from an ADP when phosphate group is attached to it during light reaction of photosynthesis.
        
             
        
        
        
The answer is petiole. Hope this helps!!!
        
             
        
        
        
The correct answer is d. it is mainly there to prevent any noxious substance from inner into the gut. 
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An omentum is a layer of the peritoneum (the serous membrane that lines abdominal cavity) that surrounds abdominal organs. It is known that omentum plays a role in immune responses. Omentum contains the clusters of white blood cells (lymphocytes), called “milky spots” which have the first-line defence role in the immune system. When a noxious substance is present, the "milky spots" induce the release of inflammatory molecules.</span>
        
             
        
        
        
Chlorophyll is the main pigment in this case. Without it, it basically would not exist.