Answer:
C. rr
Explanation:
The dominant genotype will always be denoted by the capital version, or in this case R. 
The round pea shape is dominant to the wrinkled pea shape, which means that, in the Punnett Square, the combinations of RR, Rr, rR, will all come out to be round pea shape. 
The last box, rr, would be the one that gives the wrinkled phenotype. 
In this case, by ratio, wrinkled phenotype show up 25%
                     by ratio, round phenotype show up 75%.
 
        
             
        
        
        
Sunlight is the main energy source
        
             
        
        
        
Answer:
Photosynthesis is the process, in which the chloroplast in plant cells convert sunlight to energy for the plant