Balance the following equation

CH₄ + O₂ → CO₂ + H₂O

CH4 + 2 O2 - - - > CO2 + 2 H2O

Explanation:

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you can check by adding all the numbers on both sides

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particle   p is an electron and particle q is a neutron

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.