Answer:
Enzymes speed up the chemical reactions in living cells.
Explanation:
An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell. The enzyme is not destroyed during the reaction and is used over and over.
 
        
             
        
        
        
Explanation:
Eukaryotic cells are more complex than prokaryotes, and the DNA is linear and found within a nucleus. Eukaryotic cells boast their own personal "power plants", called mitochondria.
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Answer:
A. A genetically engineered crop that is resistant to insect pests could also harm helpful insects. 
B. Crops can be genetically engineered to have useful traits that are not found in wild populations,
Explanation:
 
        
             
        
        
        
Answer:
Radioactive dating of rocks
Explanation: