It refers to making or crating new genes in form of mutation
in duplicates of old genes. It is also a mechanism in major way through new
genetic material is generated during evolution. The duplication happens in
event termed unequal crossing over or recombination between misaligned
homologous chromosomes during meiosis. 
 
        
             
        
        
        
Explanation:
respiration because it's about blood circulation 
 
        
             
        
        
        
winds also B. because winds change the air pressure meaning thats the answer
 
        
             
        
        
        
Answer:
In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells
 
        
                    
             
        
        
        
Answer:
In this photo, one can observe the big mountains, the clear blue sky, the sand which covers the ground, the path down the middle and the variety of dry, green plants.
Explanation:
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