Across
- 3. Mammals, Reptiles, Arachnids
- 5. a massive, luminous sphere of plasma—primarily hydrogen and helium
- 6. The basic structural and functional unit of all living organisms
- 7. A pure substance consisting only of atoms with the same atomic number
- 10. Force that opposes motion between two touching surfaces
- 12. Force that pulls objects toward the center of the Earth
- 13. the scientific study of Earth
- 16. Natural selection and adaptation
- 17. Inheritance and DNA terms
- 18. A biological community of interacting organisms and their physical environment
Down
- 1. Molecule carrying genetic information in most organisms
- 2. Solids, Liquids, Gases
- 4. Early human history/fossils
- 8. Earth's moving plates.
- 9. Evaporation, condensation, rain
- 11. The envelope of gases surrounding the earth or another planet
- 14. a push or pull acting upon an object resulting from its interaction with another object
- 15. Smallest particle of an element, consisting of protons, neutrons, and electrons