Old Earth Age – The belief of some creationists that the Earth may be hundreds of millions of years old.
Oligocene Epoch – A geological period that took place between 38 million and 24 million years ago.
Ontogeny recapitulates phylogeny – The development of the human embryo retraces the evolutionary development of the human race.
Order – A classification of organisms in which members share more characteristics in common than members of a class.
Organism – A living being; an individual made up of interdependent organs.
Ornithology – The study of bird life.
Oligocene Epoch – A geological period that took place between 38 million and 24 million years ago.
Ontogeny recapitulates phylogeny – The development of the human embryo retraces the evolutionary development of the human race.
Order – A classification of organisms in which members share more characteristics in common than members of a class.
Organism – A living being; an individual made up of interdependent organs.
Ornithology – The study of bird life.