<span>I think the correct answer among the choices listed above is option C. The organism described most likely is a starfish. This is because annelids and mollusks exhibit spiral holoblastic cleavage while the echinoderms have radial holoblastic cleavage.</span>
        
                    
             
        
        
        
Answer :Four characteristics were to be used for the classification of all viruses:
 Nature of the nucleic acid in the virion.
 Symmetry of the protein shell.
  Presence or absence of a lipid membrane.
  Dimensions of the virion and capsid.
Explanation:
 
        
             
        
        
        
Answer:
N
Explanation:
Both carbohydrates and lipids contain Carbon, Hydrogen, and Oxygen. However, all proteins have Nitrogen as well.
 
        
             
        
        
        
Vitamin niacin ( vitamin B3)