Answer:
1.a, 2.b, 3. c, 4. c, 5. c
Explanation:
1.
4H+O2→2H2O
2.
They must have two or more reactants.
3.
The reaction has more than one product.
4.
S + O2→SO2
5.
2Mg+O2→2MgO
B
DACEB
Answer: living space
