DNA with high GC-content is more stable due to intra-strand base stacking interactions.As noted above, most DNA molecules are actually two polymer strands, bound together in a helical fashion by noncovalent bonds; this double stranded structure (dsDNA) is maintained largely by the intrastrand base stacking interactions, which are strongest for G,C stacks.. 
Brasil ni orile-ede eledeṣọ́ tótóbitó lagbaye, ati ikan ṣoṣo ni orile awon Amerika.O ni Bode mo Okun Atlantiki ni ilaọrun, Brasil ni Etiomi to to .. 