D. To assist former slaves with getting jobs, education, food, and clothing.
        
                    
             
        
        
        
<span>Like many Mesoamerican pyramids, each was constructed around a core of rubble held in place by retaining walls. The walls were then faced with adobe bricks, and then covered with limestone. The base of the Pyramid of the Sun measures 730 feet per side, with five stepped terraces reaching a height of some 200 feet.</span>
        
             
        
        
        
Allele frequency is used to display the genetic diversity of a species population .
Explanation:
To calculate the frequency of the recessive allele we use the  
THardy-Weinberg equation 
p² + 2pq + q² 
p+q=1
p is the frequency of the homozygous dominant genotype
q is the frequency of the homozygous recessive genotype
 2pq is the frequency of the heterozygous genotype. 
Total number of individuals = 45 + 30+ 25 = 100
So, the frequency of recessive trait = 25/100 =0.25.
Thus, the value of q² = 0.25
So, q would be equal to square root of 0.25 which comes out to be 0.5