Taxonomy

Morphology

classification

Classification system

classfication by letter

binomial nomenclature

Scientific name

Characteristics

cladogram

derived character

Evolution

adaptation

artificial selection

common descent

fitness

natural selection

speciation

struggle for existence

variation

embryology

fossils

transitional forms

geographical distributuion

geology

molecular biology

nuclear chemistry/radioactive daitng

half-life

analgous stuctures

homologous structures

vestigial structure