Answer:
For a second there I thought it was a dog
Answer:
a human and a fish also bacterium
Explanation:
Because they are non renewable sources of energy and they took billions of years to form.
Easy:
1. 2K + Br2 — KBr
2. 4Sb + 3O2 — SB4 O6
Medium:
1. 2Na+2H2O — 2NaOH+H2
2. 2KNO3 — 3KNO2+O2
Hard:
1. 4NH3+5O2 — 4NO+6H2O
2. C2H5OH+3O2 — 2CO2+3H2O
