If I remember correctly from my science class, it is Protons and Neutrons.
Hope this helps, if not, comment below please!!!
Don't take my word for it but I think it is
1: proteins
2: energy from the sun, carbon dioxide, and water
3: this one is confusing me but I think it would be nutrients from food and oxygen
4: water
Again these are attempts I can't prove these
Answer:
I think it's nitrogen I'm not really sure..
Answer:
Ice
Explanation:
When ice melts it makes water