Fact
Hypothesis
Test
Theory
Hierarchy
Organism
Organelle
Tissue
Organ
Organ system
Molecule
Development
Phenotype
Genotype
Taxonomy
Nomenclature
Binomial Nomenclature
Biological species concept
Morphological species concept
Genus
Species
Evolution
Common descent
Clade
Phylogeny
Common ancestor
Ancestor
Paraphyletic group
Polyphyletic group
Cladistics
Cladogram
Outgroup
Polarity
Polytomy
Parsimony
Australopithecus afarensis