The general rule is that anything that is passed on in reproduction does not undergo senescence.

I am convinced that it is the light and the way.

The general rule is that anything that is passed on in reproduction does not undergo senescence.

The only realistic view is that a human life arises gradually, which is not much help in making personal decisions or devising public policy.

Ever since then, all descendant vertebrates have had the forward end of the digestive system and the forward end of the respiratory system very much involved with each other. This manifests itself in the human body with a crossing of the two systems in the throat.

Many traditional religions foster attitudes that ought to have disappeared as biological understanding accumulated over the last century.

Most evolving lineages, human or otherwise, when threatened with extinction, don't do anything special to avoid it.