Across
- 4. the change in frequency of an existing gene variant in the population due to random chance
- 5. the identification by humans of desirable traits in plants and animals, and the steps taken to enhance and perpetuate those traits in future generations
- 8. the inability of a species to breed successfully with related species due to geographical, behavioral, physiological, or genetic barriers or differences
- 10. a defense or tactic that organisms use to disguise their appearance, usually to blend in with their surroundings
- 12. the combination of all the genes (including alleles) present in a reproducing population or species
- 13. the differential survival and reproduction of individuals due to differences in phenotype
- 14. the science of determining the relative order of past events without necessarily determining their absolute age
- 16. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
- 17. the history of life as documented by fossils
- 18. the complete set group of individuals, whether that group comprises a nation or a group of people with a common characteristic
- 19. the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth
- 20. those from organisms that share a common ancestor
- 21. the action or process of adapting or being adapted
- 22. Early stage in the development of humans and other animals or plants
Down
- 1. occurs when two populations are separated by geographic barriers such as rivers, mountains, or bodies of water
- 2. features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature
- 3. the similarity of one organism (the mimic) to another (the model) that enhances the mimic's fitness through its effect on the behavior of a third party, the operator
- 6. a broad and holistic science that examines spatial patterns of biological diversity
- 7. an organism's ability to survive and reproduce in a particular environment
- 9. a major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence
- 11. (of a species, family, or other group of animals or plants) having no living members; no longer in existence
- 15. various cells, tissues, and organs in a body which no longer serve a function