The other is a result of ones radiation or sun exposure
        
                    
             
        
        
        
In summer, the green pigments or the chlorophyll are high, while in fall the chlorophyll lowers because there is less sunlight.
chlorophyll is a green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis. Its molecule contains a magnesium atom held in a porphyrin ring.
 
        
             
        
        
        
 It means to make something productive. "the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote."
 
        
                    
             
        
        
        
Hi there!
We can go through the overall function of all three of these:
mRNA: transcribed from the DNA, has the protein's composition written in it, and brings that to a ribosome where the protein will be made
tRNA: looks at the codons (set of 3 nucleotides) on the mRNA and brings amino acids which match up to that codon
rRNA: significant part of the composition of ribosomes
Now, looking at these, and back to the answer choices, we can already see that a, b, and c are correct. d, on the other hand, is incorrect. 
Hope this helps! Feel free to let me know if you have any questions about this specific problem.