It is respiration because all living things do it and have to do it because they have to make energy to survive. After all, respiring is just a reaction that makes energy to go into cells, doesn't matter if it's a plant or jellyfish or whatever.
Every population has limiting factors
The oxidation of organic compounds by molecular oxygen to produce CO2 and water releases free energy because electrons are being moved from atoms that have a lower affinity for electrons.
Since there are 4 nitrogen bases available and in a triplet codon, 3 bases are named, there should be 64 possible combinations. Some amino acids are coded by more than one codon. In this case, the answer to this problem is B.Every single amino acid has more than one codon.