Answer:
amount of fertaliser--> the independant variable is the one being changed
Answer:
I think it is called a Mixture
Explanation:
Sorry if it is wrong
Answer:
B) The group the atom is located
C) There needs to be 2 Na atoms and 1O atom to form Na2O
B. 6 atoms of carbon C
I would think this is the answer, because one can't just delete or add atoms; otherwise, the equation would be unbalanced. This also abides with the Law of Conservation of Mass.
Plus, I also came to that conclusion because if we look at the net equation of photosynthesis:

––>

The number of Carbon atoms is 6 on both the reagent's side and the product's side.
The answer to this is a solution