Across
- 4. adjustment to environmental conditions
- 5. the condition of having or being composed of differing elements
- 6. structures body parts that are alike because the species in question share a common ancestor
- 7. selection selective breeding
- 9. variation variation in alleles of genes, occurs both within and among populations
- 10. a predecessor
- 12. detached or separated
- 13. anatomy the study of similarities and differences in the anatomy of different organisms
- 16. selection gradual, non-random process by which biological traits become either more or less common in a population as a function of differential reproduction of their bearers
- 17. rock formed from pre-existing rocks or pieces of once-living organisms
- 19. the change in the inherited characteristics of biological populations over successive generations
- 21. record the remains or imprints of the organisms from earlier geological periods preserved in sedimentary rock
Down
- 1. diagram used in cladistics which shows relations among organisms
- 2. Darwin British scientist who laid the foundations of the theory of evolution
- 3. The process by which cells or tissues undergo a change toward a more specialized form or function, especially during embryonic development
- 8. to cease to exist
- 11. animals that have a backbone or spinal column
- 14. Beagle a Cherokee-class 10-gun brig-sloop of the Royal Navy
- 15. structures Structures that have similar functions in two organisms that have not evolved from a common ancestral form
- 18. Islands Darwin sailed to Galapagos on board the HMS Beagle in September 1835, when he was 26 years old
- 20. Malthus thought that human population increases much faster than agricultural production