Answer:
Photosynthesis used carbon dioxide, while cellular respiration produces carbon dioxide.
Explanation:
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The correct answer is natural selection. C is the answer!
Bacteria has a stronger resistance that usually produces even more resistant bacteria, and the cycle just repeats itself, making more and more resistant bacteria. This process is called Natural Selection. 
 
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-Chris
        
             
        
        
        
Often referred to as the molecule of life, DNA (deoxyribonucleic acid) is found in almost all living things. It acts as a type of chemical code that contains instructions, known as genes, for how the body and all its different parts grow, develop, function, and maintain themselves.
 
        
             
        
        
        
Cellular respiration occurs with a product of Carbon Dioxide (CO2)