If an atom is unstable it can become stable by the gain or loss of electrons.
Oxygen is made and so is glucose (its actually sugar, but glucose is better sounding) by combining carbon dioxide and water using light energy as a source of energy. Also like to make sugars.
I do beleive that the answer is c
Answer:
The well labelled diagram of a fern plant in division Pteridophyta.
Answer:
cutting down all trees for lumber