Across
- 1. The fossil record consistent with the biological theory of evolution because it shows that Earth's organisms have _____ over time.
- 3. The fossil record supports the theory of evolution because it shows _____ changes over time.
- 5. Another way to describe natural selection is survival of the _____.
- 6. _____ selection is another term for selective breeding.
- 7. Selective breeding is performed by _____ to achieve desired traits, while natural selection occurs without _____ being involved.
- 9. _____ diversity describes the number of different kinds of genes present in a population.
- 11. Characteristics that are not beneficial to a species tend to _____ in frequency over time because the characteristics have a low survival rate.
- 14. In layers of rock, the oldest fossil would be found in the _____ layer.
- 16. Artificial selection and natural selection both result in changing traits in species over _____.
- 17. According to the theory of _____ through natural selection, organisms that survive are those that have adapted to the living conditions.
- 18. The fossil record is assembled by combining the data scientists learn from the fossils they study and allows scientists to develop a _____ showing the evolution of life from earlier species.
- 20. Charles Darwin's theory that evolution was caused by natural selection explains the sequential nature of groups in the fossil _____. The idea that earlier, simpler species have been replaced by later, more complex species explains the diversity of fossils.
- 21. Some species are able to survive major changes in the environment because they have variation within their _____, giving individuals an advantage for surviving change.
- 22. All adaptations are _____, but _____ are adaptations only if they help organisms survive.
- 23. Changes in DNA are known as _____ and can sometimes (not always) produce beneficial changes (adaptations) in populations.
Down
- 2. Lack of genetic variability prevents a species from adapting to environmental changes, making the species more prone to _____.
- 4. Antibiotic _____ occurs when variation in an initial population of bacteria leads to some bacteria surviving an antibiotic and reproducing while other bacteria die off.
- 8. Advantageous traits are likely to increase in future generations because individuals with the traits are more likely to _____, passing their genes onto their offspring.
- 10. Natural selection acts on a population to produce individual organisms with different adaptations. The usefulness of these adaptations is tested by interactions in the surrounding _____.
- 12. Natural selection is typically a gradual process, but can operate extremely rapidly to develop advantageous traits in populations that are facing a change in _____ conditions.
- 13. selection, _____ favors the survival of individuals that produce the most reproductively viable young that have adaptive characteristics and can themselves reproduce.
- 14. _____ refers to the existence of a wide range of different types of organisms in a given place at the same time.
- 15. A disadvantage of selective breeding is that it can reduce genetic _____.
- 19. According to the theory of natural selection, the ability of individuals to _____ to their environment makes them more likely than others to survive and reproduce.