Across
- 4. When there are no more members of a species left on Earth
- 6. Minimum Viable Population
- 10. Different gene versions
- 12. Formed around 4.5 billion years ago
- 13. Occurs when two or more populations no longer successfully reproduce
- 15. A famous transition fossil
- 16. Narrow strip of land connecting North and South America
- 17. Only 1 in about 2 million lobsters are this color
- 18. Traits/Behaviors that are beneficial for survival
- 20. Most fossils found in this rock
- 23. 50% or more of all species on Earth disappear
- 24. Molecules needed to build and repair body structures
Down
- 1. Humans decide which traits are beneficial
- 2. A group of individuals that can reproduce successfully
- 3. The Ashfall Fossil Beds are found in this state
- 5. Proteins are made up of these smaller molecules
- 7. Layer that absorbs UV rays from the sun
- 8. Changes to DNA
- 9. Collection of all known fossils
- 11. Change in inherited traits of a population over many generations
- 14. The environment decides which traits are benficial
- 19. Millions of years ago
- 21. Fossilized tree sap
- 22. Have been extinct for around 65 million years