Answer:The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.
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A gene in an egg cell inserts two extra base pairs!!
        
                    
             
        
        
        
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reproduction growth and development regulation, homeostasis, and energy processing
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C. Producing gametes for sexual reproductive purposes