<span>They are emitted by the unstable nuclei of certain atoms.
That's all I could find out; Sorry I couldn't be more of an help.</span>
I would said A is the best option if i’m wrong sorry
<span>Which electromagnetic waves have the shortest wavelengths and highest frequencies?
Gamma rays </span>
I love science! if you need any more help let me know i cant guarantee i can help but i will try!
The correct answer is "Some substances must be dissolved in water before they can be used".