Becausebof he law of conservation of evergy. Evergy can not be created of eliminated, therefore it has to be transfered in this case the energy is transfered from one organism to the otherand this process continues at an endless cycle
        
             
        
        
        
Answer:
The correct answer is nitrogen base
Explanation:
The nucleotide sequence of one codon differ from that of another codon by the presence or absence of specific nitrogen base.The nucleotide sequence of different codons contain different nitrogen bases.
        As a result change in genetic code result from the change in the nitrogen bases  of the codons present in the genetic code.
   In simple words change in single nitrogen base of a codon will change the entire codon.
 
        
             
        
        
        
Biosphere: All living things
Lithosphere: The crust and outer mantle of Earth
Atmosphere: The air and gasses that surround Earth
Hydrosphere: All water on Earth