I believe it is D, all of these. :) I hope this helps! Please tell me if I'm wrong :)
Hydrogen has one valence electron. To make it an ion, you need to remove this valence electron. When you remove an electron, the element becomes positive because you are taking away the negative
I think it’s c bc it say one way to make the earths coal supply last longer and you can build and use solar power plants
This list of characteristics describes organisms in the united kingdom
