<span> Descriptive theories help direct specific nursing activities</span>
        
             
        
        
        
Answer:
I would say B
Explanation:
Because atural selection is the mechanism for how evolution occurs over time. Basically, natural selection says that individuals within a population of a species that have favorable adaptations for their environment will live long enough to reproduce and pass down those desirable traits to their offspring.
 
        
             
        
        
        
Stage 3  because the person fev1 level is go down not up 
        
             
        
        
        
Let me help you, 
The process in which two gametes unite is called fertilization. 
Have a good one! 
        
                    
             
        
        
        
If you look at two species in their embryogenic stage. their bones and their forms look similar and you can differentiate too.
if you look at a fish and a human... 
humans wont have the the fins protruding in the fishes embryo, showing how different they are. <span />