Challenging puzzle for experienced crossword solvers
Fundamental Forces and Life Science
Moderate difficulty suitable for most players
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Across
- 1. Force that attracts objects toward Earth
- 3. Atoms of the same element with differing neutrons
- 5. Nerve cell transmitting signals
- 7. Protein that speeds up chemical reactions
- 8. Smallest unit of ordinary matter
Down
- 2. Change in a DNA sequence
- 4. Preserved remains of ancient organisms
- 6. When one celestial body blocks another
- 9. Unit measuring electric potential
- 10. Layer protecting Earth from UV rays
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