I believe it is A beacuse nucleotides come from the word nucleus.
        
             
        
        
        
The blank is going to represent marijuana, LSD,PCP, and ecstasy. sited by google. hope that helped
        
             
        
        
        
Answer:
α-amino group
Explanation:
The α-amino group on the hemoglobin binds with the CO2 and this action causes a conformational change in the structure of hemoglobin that ultimately causes the release of linked oxygen. When CO2 is binded to the hemoglobin the whole complex is termed as carbamino-hemoglobin.
 
        
             
        
        
        
Answer:
Deoxyribonucleic acid (DNA)
Explanation:
the biological instructions that make each species unique. DNA, along with the instructions it contains, is passed from adult organisms to their offspring during reproduction