Hot temperatures, natural disasters, agriculture, urbanization, etc. 
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The main function of the respiratory system is to allow the exchange of gases between the atmosphere and the lungs.
Hence,the only structure that carries out this function is the alveoli as other structures such as the nose,trachea and pharynx transport gases to the alveoli just so that it can can out its function.
        
                    
             
        
        
        
For air masses to form fronts, they must collide with each other. B.
        
                    
             
        
        
        
 Correct option(s):
(b) This muskmelon plant's genotype for the fruit taste gene is ff.
(c) This muskmelon plant is homozygous for the fruit taste gene.
A dominant allele is one that is capable of expressing itself even in the heterozygous condition and overshadows the effect of the recessive allele. It is usually denoted by a capital letter. Recessive allele on the contrary cannot express in presence of a dominant allele and is denoted by a small letter. 
In the given case the fruit with a sour taste (phenotype) can have two possible genotypes (FF and Ff). The genotype of sweet taste is ff which is a homozygous condition.  
Note: Your question is incomplete, probably your complete question is “In a group of muskmelon plants, some individuals have sour fruit and others have sweet fruit. in this group, the gene for the fruit taste trait has two alleles. the allele F is for sour fruit, and the allele f is for sweet fruit. a certain muskmelon plant from this group has sweet fruit. this plant has two alleles for sweet fruit. Choose the correct option:
(a)  this muskmelon plant's genotype for the fruit taste trait is sweet fruit.
(b) this muskmelon plant's genotype for the fruit taste gene is ff. 
(c) this muskmelon plant is homozygous for the fruit taste gene.”
Know more about Mendelian genetics here:
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Answer:
The overview is defined in the clarification section elsewhere here, and according to the particular circumstance.
Explanation:
Including genetic mapping as well as tracing the characteristics of hereditary disorders, genetic markers are valuable. 
Basic DNA sequence determination for chromosomes. 
- Healthy Marker Properties. 
- This needs to have been Polymorphic. 
- It is indeed meant to be non-epistatic. 
- Throughout the genome, these are distributed uniformly.