This is known as double helix. Nucleotides each have three parts: phosphate, sugar molecule<span>, and one of four </span>bases<span>. The </span>bases<span> include: A, (adenine), g (guanine), t (thymine), c (cytosine). ... </span>Explain why complementary base pairing is necessary to maintain the double helix shape of the DNA molecule<span>.</span>
        
             
        
        
        
Answer:

Explanation:
It is given that 
B is the dominant allele which represents the black color
and b is the recessive allele which represents the white fur. 
B being dominant will result into black color fur for genotype "Bb"
Given - 
Frequency of black fur allele (p) is 
As per Hardy Weinberg's  first law of equilibrium

Substituting the value of p in above equation, we get - 

q represents the frequency for white fur allele
Frequency of white fur phenotype is 

Frequency of homozygous black fur phenotype (BB) is 

As per Hardy Weinberg's second law of equilibrium - 

Combined frequency of homozygous and heterozygous black fur phenotype is 

 
        
             
        
        
        
They are the primary producers
        
             
        
        
        
Answer:
Natural Selection
Explanation:
The process of where organisms with favorable traits that help them adapt to an environment are more likely to reproduce and survive. Organisms with less favorable traits are less likely to survive in the environment. This theory was first developed by Charles Darwin and has grown to be the most believed process of evolution.