There's 39 chromosomes in the sperm cell. Why? Because sperm cells are gametes and therefore they are haploid cells meaning they have half the number of chromosomes of a regular cell or diploid cell. 
78 / 2 = 39
        
             
        
        
        
Answer:in addition are formation of goose pimples and erection of hair muscles so as to trap more air thus insulation
 
        
             
        
        
        
It is soil after wind for example wind storm causes to soil erosion
        
             
        
        
        
Maintain homeostasis - eg. blood sugar control by insulin and glucagon.<span> 
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Answer:
early all of the hydrogen consumed in the United States is used by industry for refining petroleum, treating metals, producing fertilizer, and processing foods. U.S. petroleum refineries use hydrogen to lower the sulfur content of fuels.
Explanation: