Answer: Probably, harder the mineral it scratches. It makes more sense.
Answer: No unethical experiment can ever have a positive effect on society.
Explanation:
I think it would be false because it realates with respiratory
1 - Geosphere.
2 - Biosphere.
3 - Cryosphere.
4 - Atmosphere.
5 - Hydrosphere.
Please correct me if I'm wrong!! I'd be happy to fix it!!! :)
