Answer: it's not a few days. 
Explanation: I picked a few days and got it wrong.
 
        
             
        
        
        
If a given moth population is at Hardy-Weinberg Equilibrium, we can conclude that the changes in the allele frequency of the population over time is constant. This means that in the absence of evolutionary influences, allele or genotype frequencies remain constant from one generation to the next or so on.
        
                    
             
        
        
        
Answer:
I think the answer is A) biological species concept
 
        
             
        
        
        
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Transport systems in the blue jay (circulatory) and pine tree (vascular) are described (xylem and phloem — little hollow tubes that conduct water, sugar, and nutrients; system of valved blood vessels and a muscular pump - the heart).
        
             
        
        
        
It spreads blood and oxygen throughout your body.