Answer: The mass number is 13
Explanation:
Mass number = Protrons + neutrons; 
While Atomic number = Number of neutrons 
Therefore, if the atomic number of nitrogen is given as 7, then its Protrons = 7
So, mass number = 7 + 6 = 13
 
        
             
        
        
        
Answer:
The survival and reproductive success of an individual is directly related to the ways it's inherited traits function in the context of its local environment
Hope this helps 
 
        
             
        
        
        
Peremeability ,<span>Water can pass freely through the cell membrane.</span>
        
                    
             
        
        
        
Answer:
I believe the first one would be incomplete dominance, the second would be multiple alleles, and the third would be codominance. 
Explanation:
The first one would be incomplete dominance because the child has a blend of the man's straight hair and the woman's curly hair, but neither of two hair types are completely dominant (if that makes sense). 
The second one would be multiple alleles because, well, there are multiple alleles listed (more straightforward than the other two).
And the third one would be codominance because the traits of red color and white color are equally dominant. 
 
        
             
        
        
        
Answer:
a. allow a variety of molecules to cross the cytoplasmic membrane 
Explanation:
The cells have different molecules in its membrane. As a membrane the main function of it is to regulate the income and outcome of substances that the cell needs or the cell has like some wastes. 
Some of these molecules can be some proteins like the permeases, that is going to  regulate the solutes that can enter the cell, but since they are non specific, that means that can not make the difference among one carbohydrate and another (as an example).