Glossary of "An Introduction to Biological Evolution (2nd ed.)" by Kardong (2008)
- Somatic traits of an organism developed as a consequence of activities during the organism's lifetime; Lamarck's theory that characters arise from use or are lost from disuse.
- Kardong, K. V. 2008. An Introduction to Biological Evolution, 2nd ed. -xvi + 352 pp. McGraw-Hill, New York.