The belief that all present life evolved from a few common ancestors.
The Darwinian belief that evolution takes place in innumerable small steps. Led
Darwin to believe that the world was much older than previously thought.
The theory of evolution proposed by Charles Darwin. It holds that species
change over time and that this change comes about through the mechanism of
The theory holding that competition exists within species, determining which
species live to have offspring, and pass their traits on to those offspring.
The Darwinian belief that there are random phenotypic variations within species
that confer advantages selected for by natural selection; these variations
can be passed from parent to offspring.