Because they create their own food so they capture sunlinght to produce sugars
By lowering the activation energy, it helps the reaction go faster.
It's C! It changes as new evidence is found.
NaCl: natriumchloride. 1 atom of each, so the 2 is too much and I (capital i here) is another element
So for the second excercise the number behind the symbol is the amount of atoms in the compound. So easily 2 atoms of Li, 1 atom of S and 4 of O
