I think the first blank is human but i have no idea for the second and third, did you get a vocabulary sheet at all?
        
             
        
        
        
Genes<span> are distinct portions of an organism’s </span>DNA<span> that correspond with a specific trait, while </span>alleles<span> are different versions of a given </span>gene<span>. </span>
        
             
        
        
        
The term that refers to the process
in which two gametes fuse to make one zygote is called fertilization. Fertilization
<span>is the union of male
and female gametes (reproductive cells) to produce a zygote (fertilized egg).
</span>The correct answer between all the choices given is the third choice or
letter C. I am hoping that this answer has satisfied your query and it will be
able to help you in your endeavor, and if you would like, feel free to ask
another question.
 
        
                    
             
        
        
        
An isotonic solution is a solution in which the amount of dissolved material is equal both inside and outside of the cell. Water still flows in both directions, but an equal amount enters and leaves the cell.  Hope this helps. :)