Across
- 3. a group of the same species that lives in an area
- 5. the ability to survive to reproduce
- 7. requires oxygen
- 13. ATC or G
- 14. where chromosomes line up in the center of a cell
- 15. three letters that code for an amino acid
- 17. includes all living and nonliving things in an area
- 19. when all members of a species are gone
- 20. the process of forming one species from two
- 21. a structure that had a function in an ancestor
- 22. two of the same allele
- 23. where DNA is stored
- 24. selection the mechanism that allows evolution
- 25. results in two identical cells
- 27. the building blocks of proteins
- 28. the allele that shows
Down
- 1. changes in a population due to chance
- 2. how plants make energy from sunlight
- 4. non-living components of an ecosystem
- 6. gives off energy
- 8. continuous thread of DNA that contains many genes
- 9. the variety of species within an ecosystem
- 10. the most common element in Earth's atmosphere
- 11. occurs when two organisms compete for the same resource
- 12. keeping constant internal conditions
- 16. the powerhouse of the cell
- 18. smallest basic unit of matter
- 25. results in four cells with half the information
- 26. element contained by all living things