The type of radiation that can penetrate through paper, but not through wood is called beta rays. Beta rays can penetrate paper and air, but a thin piece of alimony can stop it. Gamma can cut through anything except lead and many inches of concrete. Alpha can be stopped by paper and not penetrated. The correct answer is B.
I think the North Pole
If I understand this correctly
The answer is C. Elements
Elements cannot be broken down int simpler substances even by chemical means