Answer:
four types of nitrogen bases od DNA nucleotides are; Thymine, Adanine, guanine and cytosine
 
        
             
        
        
        
<em>Full Question:</em>
<em>Which tissue is correctly paired with its primary cell type?</em>
<em>bone: fibrocyte</em>
<em>bone: osteoblast</em>
<em>connective tissue proper: chondroblast</em>
<em>cartilage: fibroblast</em>
Explanation:
<em> </em><u><em>bone: osteoblast</em></u>
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Osteoids comprise, significant sections of the entire bone matrix, and  this includes fibers of collagen which give bone its flexibility and mechanical strength this allows born to resist stretching and twisting forces. 
Osteoblasts are highly specialized cells within bone which formulate new bone through the production or secretion of parts of the organic matrix; this is referred to as the osteoid and mediate the calcification (fortification with allium) of osteoid during the formation of mature bone matrix.
 
Learn more about bone growth and development at brainly.com/question/6957100
 
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Except for the evolution of new diseases, because that’s bad, and it stops us I think, not sure though.