C. A capsid is a protein coat that protects the genetic material of the virus
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Answer:
A solid rock becomes soil when it breaks down and combines with water, air, and organic matter. 
 
        
                    
             
        
        
        
The answer is a simple radial nervous system.
Echinoderms do not have brains. Around their mouth, they have central rings from which nerves radially run into arms and along the body. Movement is controlled by the branches of those radial nerves.
        
                    
             
        
        
        
Answer:
tertiary structure
Interactions among the amino acid side chains within a single protein molecule determine the protein's tertiary structure. Tertiary structure is the most important of the structural levels in determining, for example, the enzymatic activity of a protein.
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