C. Directions: Write True if the underlined word is correct and False if it is wrong. Write the correct answer on the space provided before the number. 1. There are three important things needed for combustion to occur. 2. The presence or absence of oxygen has various effects on matter these are the combustion and flammability. 3. Rusting is caused by the reaction of iron with oxygen present in the air. 4. The amount of combustion formed in an iron depends on the moisture and humidity of the surrounding. 5. When an apple is cut, the fleshy part of the fruit changes color into yellow. __6. Carbon dioxide is a part of the air that surrounds us. 7. Iron when combined with oxygen form rust. 8. Oxygen can cause changes on different materials. 9. Lighted candle shows the absence of oxygen. 10. New chains show the presence of oxygen.​