I believe <u>B.) Analogous structures show that living in similar habitats doesn't lead to similar adaptations </u>is your right answer.
 
        
             
        
        
        
Both have phosphate-pentose back bone, as well as both have adenine, cytosine and guanine bases. 
        
             
        
        
        
A) 5
Half-life is the time it will take for a quantity to reduce to half its initial value. In this case, uranium will undergo radioactive decay, and after 700 mil years, 5 of the 10 uranium atoms will have decayed.
        
             
        
        
        
Answer:
The binding of oxygen and hemoglobin is also an important reversible reaction. Its how oxygen is carried around the blood to the cells of your body
Explanation:
A reversible chemical reaction is one that can go in both directions; reactants can turn into products, and products can turn back into reactants.