The feedback loops communicate with the body to ensure homeostasis.
Answer is A. Feedback Loops 
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After the macrophage fails the Helper T Cell stimulates the B cells if pathogen is extracellular and Cytotoxic T Cells if the pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells.
        
             
        
        
        
Droughts and high winds can lead to severe wildfires. Wind contributes to the flames spreading. Droughts mean dry plants and dry grass. 
 
        
                    
             
        
        
        
Answer:
(1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division.
 
        
             
        
        
        
We rely on Meiosis so that we can produce/have genetic diversity. It also enables us to have proper conditions for reproductive success.