This is because of natural selection; since polar bears live in a rough environment, natural selection gives them more fur, more muscle, and can go longer without food
I'm not sure if this is correct but No. 1 it provide home's.
No. 2 is that it is a hideing place for prediters and their pray.
The nucleotide triplet that encodes an amino acid is called a codon. Each group of three nucleotides encodes one amino acid. Since there are 64 combinations of 4 nucleotides taken three at a time and only 20 amino acids, the code is degenerate (more than one codon per amino acid, in most cases).
Ultimately the energy released from the redox reactions in the electron transport chain is used to pump hydrogen ions down a protein pump, Called ATP Synthase and is used to phosphorylate ADP to form ATP.
