They form when electrons are shared.
Gas and radio waves I’m pretty sure is correct
Nitrogen is 78.08% of the air is fills the earth's atmosphere.
The organism would no longer grow.
He could be blindfolded and know which was his and which was his sister's. All he would need to do is pick them both up and if they were too big then pick them up one at a time. The lumber might make it harder to tell, but this is a question about physical properties.
So there is a change in mass which for the purpose of this question should be quite different. His sister's ought to be much lighter than his. He would find it easier to pick up.
