| A | B |
|---|
| The idea that living organisms are created from nonliving matter | Spontaneous generation |
| A scientific law that states that living organisms only come from other living organisms | Biogenesis |
| Theory that states that organisms have changed gradually over a long period of time to form new organisms | Theory of Evolution |
| The theory of evolution that states gradual changes in living organisms have resulted in more complex organisms | Organic evolution |
| The idea that organisms better suited for their environment will survive and reproduce | Natural selection |
| Changes in the genetic code | Mutations |
| A revision of Darwin's original theory of evolution to include modern genetics | Neo-Darwinism |
| The gradual formation of life from nonliving chemicals | chemical evolution |
| The combined ideas of Alexander Oparin and J. B. S. Haldane of how life on earth could have formed gradually from nonliving chemicals | Oparin-Haldane hypothesis |
| Existing without oxygen | Anaerobic |
| Unable to make food; requiring food from an outside source | Heterotrophic |
| A cell that contains no nucleus | Prokaryote |
| Able to make food from either the sun's energy or from other chemicals | autotrophic |
| Existing with oxygen | Aerobic |
| A cell that contains a nucleus and other membrane-bound organelles | Eukaryote |
| Theory that explains the origin of mitochondria and chloroplasts in eukaryotic cells | Endosymbiotic theory |
| A relationship between two organisms where at least one benefits | Symbiotic relationship |
| A branch of biology that classifies organisms into taxa (from kingdom to species) | Taxonomy |
| The largest taxon that contains the greatest diversity of organisms | Kingdom |
| The smallest taxon; represents a group of organisms that can interbreed and produce fertile offspring | Species |
| A system that names each organism by giving its genus and species | Binomial nomenclature |
| A system that names an organism by giving its genus and species followed by a subspecies or variety | Trinomial nomenclature |
