Answer: Option A.
Fitness.
Explanation:
Fitness is the survival or reproductive rate in which a genotype or phenotype have the ability to reproduce more successfully or leave offsprings relative to other genotypes or phenotypes. It is the quantitative representation of natural or sexual selection. It is represented by w.
 
        
             
        
        
        
I think it is light so B) light
        
             
        
        
        
In biology the three domains are Archaea, the Bacteria, and the Eukarya.
        
                    
             
        
        
        
Chemical properties? raft? 2 different realms my friend