The only true answer here is B. if you have a periodic table, you can see that Magnesium atomic number is 12 while Aluminium's is 13. this means Al has 1 more proton and weights more than magnesium since proton and neutrons contribute to the weights of the atoms.
Scientists make their hypothesis first, then they test it and collect the data
The two photosynthesis absorb the light energy though the proteins.
Answer: a variable is something to be changed or tested
Explanation:
The variable is the thing in an experiment that is changed
