Across
- 3. Refers to any change in the genetic composition of a population of organisms over time.
- 5. located in the chromosomes, made up of deoxyribonucleic acid (DNA).
- 7. inherited body parts, which are smaller and often unused.
- 12. populations of migrant species may invade the area.
- 14. refers to the loss of an entire species for various reasons.
- 15. Similar structures that evolved from the same ancestral body parts but may have different functions.
- 16. a population moves from its present habitat to a new one.
- 18. Refers to an organism in its early stages of development.
- 19. particularly common in predator-prey relationships.
- 20. global and catastrophic events that wipe out between 25 percent and 75 percent of species.
Down
- 1. connotes the idea of organisms evolving or changing into something different.
- 2. the cells that give rise to sperm and eggs.
- 4. molecules that help build and repair body parts.
- 6. refers to the movement of genes from one generation to the next.
- 8. groups of initially distantly related organisms evolve similar structures to adapt to a similar habitat or way of life.
- 9. occurs when some members of a species are suddenly separated from the rest of the population.
- 10. Scientists use them to reconstruct the complete structure of the organism.
- 11. Have similar functions but have a different anatomy.
- 13. Are preserved remains of an organism.
- 17. Refers to a group of organisms that share similar characteristics.