It’s all in socratic because i did that already and it was really easy
        
             
        
        
        
Answer:
C
Explanation:
C is what the circulitory system dosent do so its C :) Sorry, i sent this a bit late.
 
        
                    
             
        
        
        
Explanation:
Nucleotides are organic molecules consisting of a nucleoside and a phosphate. They serve as monomeric units of the nucleic acid polymers – deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), both of which are essential biomolecules within all life-forms on Earth. Nucleotides are obtained in the diet and are also synthesized from common nutrients by the liver.
Nucleotides are composed of three subunit molecules: a nucleobase, a five-carbon sugar (ribose or deoxyribose), and a phosphate group consisting of one to three phosphates. The four nucleobases in DNA are guanine, adenine, cytosine and thymine; in RNA, uracil is used in place of thymine.
 
<em>Hope</em><em> this</em><em> helps</em><em> please</em><em> like</em><em> and</em><em> mark</em><em> as</em><em> brainliest</em><em> </em><em /><em />
 
        
                    
             
        
        
        
Explanation:
 The experimenter alters the independent variable with the hopes of collecting data about how the dependent variable changes in response.Other variables have to be controlled so that any changes of the dependent variable are attributed to the known independent variable.