Answer: Option A
Explanation:
The heterozygous allele can be defined as the condition in which the organism has two different alleles of the gene.
It is represented as Rr, means a capital letter and a small letter. This hows that the organism has one dominant gene and one recessive gene in it.
This dominant and recessive condition decides the genotype and phenotype of organism.
 
        
                    
             
        
        
        
Answer:
I'm sorry but you should do it on your own because if you don't you won't learn the way you should and plus that is cheating. 
 
        
             
        
        
        
Answer:
Earth's Upper Atmosphere. And Volcanoes.
 
        
             
        
        
        
Answer:
B 
Explanation:
negative feedback is used to regulate feedback
 
        
             
        
        
        
Answer:
C. 
Explanation:
It's a single strand of circular DNA found in the central area of the cell, which is not surrounded by a nuclear membrane.