Across
- 3. The selective breeding of organisms by humans for certain desirable traits (2 words)
- 9. This term refers to the variety of living things that inhabit Planet Earth (2 words)
- 11. A method of breeding that allows only certain organisms with desired characteristics to mate and produce offspring (2 words)
- 18. A letter from this scientist prompted Darwin to publish his book, "On the Origin of Species"
- 19. Body structures that are similar in structure but are different in function
- 21. The age of an object in relation to the ages of other species (2 words)
- 23. The relatively sudden appearance of new species when organisms move into vacant niches (2 words)
- 24. Structures that serve no purpose in a living organism. They seem to be left over from a previous ancestor
- 25. Darwin used this phrase to indicate that every species must have descended from preexisting species and that each species had changed over time
- 26. an explanation that has been heavily tested and is supported by a large body of evidence
- 27. The process by which two species evolve in response to changes in each other
- 28. The terms means "change over time"
- 29. In any given population, chance _________ exist that might be passed to future generations.
Down
- 1. The ___________ provides the most powerful evidence for evolution (2 words)
- 2. Darwin used this term to describe the ability of an individual to survive and reproduce in its specific environment
- 4. The process by which different species evolve similar traits because they face similar environmental demands (2 words)
- 5. A model of evolution in which gradual change over a long period of time leads to biological diversity
- 6. This is the principle that all living things are derived from common ancestors (2 words)
- 7. An event where many types of living things disappear at the same time (2 words)
- 8. A characteristic possessed by an organism that enhances its survival and ability to reproduce in a specific environment
- 10. The actual age of a fossil determined through radioactive dating processes (2 words)
- 12. Layers of rock
- 13. The preserved remains of ancient organisms
- 14. In this process, closely related species become more and more dissimilar
- 15. The process in which individuals with certain inherited traits leave more offspring than individuals with other traits (2 words)
- 16. The study of the locations of organisms around the world
- 17. This term describes a pattern of long and stable periods interrupted by brief periods of more rapid change (2 words)
- 20. During Darwin's voyage around the world, a stop in these islands proved to be the most influential of all in Darwin's developing theory (2 words)
- 22. What was the name of the ship that Darwin sailed on? (2 words)