The system of equations 3x-5y=7 ,6x-10y=3 is

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• Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual destruction of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion
• Rancidity is the process of complete or incomplete autoxidation or hydrolysis of fats and oils when exposed to air, light, moisture, or bacterial action, producing short-chain aldehydes, ketones and free fatty acids. When these processes occur in food, undesirable odors and flavors can result.

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a) corrosion - it is the attack of surrounding like air and water on metal . corrosion like rusting of iron and black coating on silver are examples.

b) Rancidity - it is the change of odour and taste of oily and fatty substances when it is expose to air for some time . for avoiding preserve them in air tight container or by applying nitrogen gas .

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The blood circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrate. It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels.

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the system that circulates blood and lymph through the body, consisting of the heart, blood vessels, blood, lymph, and the lymphatic vessels and glands.

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