Charles Darwin,after Observing Variability Among Plant and Animal Species in Various

Charles Darwin,after observing variability among plant and animal species in various locations,proposed an explanation for what he saw.The broad proposal included reasons that species could be modified through genetic variation,leading to measurable similarity and difference.Evidence for the proposal came from biological,geographic and geological observations.His proposal allowed for prediction of new species that might be found in new settings,based on environmental conditions.Darwin's proposal is an example of

A) a standardized variable.
B) a dependent variable.
C) an independent variable.
D) a theory.
E) a hypothesis.