Yes
Explanation:
Yes, because the embargo of 1973 showed how dependent we are on just one type of fuel, so it was necessary to start looking at different ways to create energy.
 
        
             
        
        
        
Answer:
 They contain protein fibres that can contract when energy is available, making the cells shorter.
 
        
             
        
        
        
Answer:
protiens
Explanation:
 Proteins, among the most complex of all organic compounds, are composed of amino acids which contain carbon, hydrogen, oxygen, and nitrogen atoms.
 
        
             
        
        
        
The regulatory genes are not part of the lac operon.