I have no clue, there is nothing else here to support your question.
        
             
        
        
        
Answer:
d. pxp +2pq
Explanation:
The formula for genotype frequency for a population in Hardy-Weinburg equilibrium is as under:
                            p² + 2pq + q² = 1
where, p = dominant allele 
            q = recessive allele
Here, 
  p² represents frequency of homozygous dominant genotype
 2pq represents frequency of heterozygous genotype
 q² represents frequency of homozygous recessive genotype
Also, although the genotypes p² & 2pq are different from each other yet phenotypically they both will collectively produce dominant trait i.e. free ear lobes not attached earlobes. So the term "p² + 2pq or  pxp + 2pq" represents the frequency of the individuals who show the dominant phenotype in this particular population. Dominant phenotype will comprise 75% of the population. 
 
        
             
        
        
        
The decline in the overall population of trout and larger fish is because the Insect population has decreased.
<h3>What is a population?</h3>
A population is a group of organisms of the same species living in the same habitat. 
Population of organisms is affected by;
- availability of water
- space 
- food and nutrients 
- predators 
- climate change
Since the population of trout is directly affected by the number of insect species, the decline in the overall population is because the Insect population has decreased.
Learn more about population at: brainly.com/question/746835
 
        
             
        
        
        
Answer:
A
Explanation:
 a thermocline Below 3,300 feet to a depth of about 13,100 feet , water temperature remains constant. At depths below 13,100 feet, the temperature ranges from ...