Directions: Choose the correct word from the box to complete the paragraph.


Spoilage, Presence

Absence, Oxygen

Enzymes, Oxidation


______ is a part of the air that has effects on different materials. Some fruits have _______ which when combined with oxygen gives it a brown color, a sign of f o o d _______ . The combination of materials with oxygen is called ________ Combustion refers to the process where substance burns in the ___ of oxygen.