Explique la composición química del ADN y ARN, según: Azúcar, base nitrogenada y grupo fosfato

Closing a ring restricts the rotation around individual car bon carbon bonds hope it will you !

It was said to have happened by earthquakes, the shifts in the tectonic plates moved everything 

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.