I think the correct answer is a
        
                    
             
        
        
        
The Algae. Unless you want to get into the microorganisms that contribute to the algae's growth.
        
             
        
        
        
Answer:
Sialon/ACM112760324 can be provided in Alfa Chemistry. We are dedicated to provide our customers the best products and services.
Explanation:
https://www.alfa-chemistry.com/sialon-cas-112760-32-4-item-193752.htm
 
        
             
        
        
        
Many scientists are concerned that the Ogallala aquifer in the United States is being depleted at an alarming rate. The statement that is correct and would state the most likely be a major effect of this aquifer running dry is choice A. It states that many crops would die because irrigation water would be limited.
 
        
             
        
        
        
Answer:
The skeletal system is vital in supporting the immune system because : Bones contain marrow, a porous material which creates both white and red blood cells. This replenishment of cells allows the body to fight and expel harmful bacteria, environmental toxins,  foreign material e.t.c. 
The white blood cells formed by the marrow are instrumental in isolating and destroying harmful particles (either on the site or in lymph nodes), or transporting them to the kidneys or bowels for excretion.
NOTE : Some people have marrow disorders which prevent their marrow from forming new cells; this is caused most often by cancer. Today, it is possible to transplant marrow from a healthy individual to a sick patient, and so help their bone marrow form new white and red blood cells to fight their sickness.
 I hope it helps :)