I believe the answer is head-on and port (left). The side lights are usually visible to vessels approaching from the front or the side. The red light usually indicates a vessel's port (left) side while the green light indicates a vessel's starboard (right) side. These lights ensure that there is safety at night as the vessels navigate. 
        
                    
             
        
        
        
I believe the correct response would be D. Are not composed of one or more cells.
        
             
        
        
        
I think it’s an example of zaher.                        
 
        
             
        
        
        
If mutation destroys the function of the Cas9 gene then the bacteria will not be able to target a specific bacteriophage for destruction upon infection for the second time.
<h3>What is the Cas9 gene?</h3>
- Cas9 is a 160 kilodalton protein that plays a vital role in the immunological defense of certain bacteria against DNA viruses and plasmids and is heavily utilized in genetic engineering applications.
-  Its main function is to cut DNA and thereby alter a cell's genome. 
- Although Cas9 is an endonuclease and is evolved as a mechanism of immunity against viruses, they are not considered restriction enzymes.
To learn more about the Cas9 gene,
brainly.com/question/22549100
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The only oral anticoagulant available was 
warfarin