The study of similar morphological features across different species.
The theory of the origin of life, which states that all life was created in its current form by God in a mass creation event that took place about 6000 years ago.
The passing on of traits acquired during a parent's lifetime to offspring
The theory of evolution stating that species change over time and that this change occurs through use and disuse and the inheritance of acquired traits.
The Lamarckian evolutionary idea that if an animal often used a particular trait or characteristic, that trait or characteristic would become more pronounced. Alternately, if a trait went unused, it would become less pronounced.