Across
- 3. the formation of new and distinct species
- 6. a change that helps an organism to be better suited for the environment
- 11. new species from old species
- 14. structures that are similar in function but they are not from the same ancestor
- 18. the movement of genes into and out of the population i.e. migration
- 20. a biological structure that has lost a major ancestral function i.e. useless
- 21. all the possible genes in s certain population
- 24. the study of living matter
- 25. slow elimination of a population an example if this is climate change
- 26. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding
- 27. biological change that causes descendants to be different from there ancestors
- 28. reproduction based on preference not random
Down
- 1. bursts of change followed by a long period of stability
- 2. study of the body to prove evolution is occurring
- 4. geographical distribution of plants and animals
- 5. slow changes over a long period of time
- 7. the idea that species change over time give rise to new species and share a common ancestor
- 8. all the inhabitants of a certain area
- 9. the study of embryos of species to find related species that descend from the same ancestor
- 10. species sharing a common ancestry become more distinct
- 12. organisms change due to the environment
- 13. structures that are similar but perform a different task based on environment
- 15. two organisms that evolve to depend on one another
- 16. the remains of prehistoric organisms
- 17. the changing of the structure of a gene
- 19. when different species have similar characteristics
- 22. the study of prehistoric species
- 23. a catastrophic event that causes sudden change in the environment