1) What is the Chemical symbol of Sodium?  a) Na b) So 2) Which part of human body is primarily responsible for filtering blood? a) Liver b) Kidney 3) Which gas is abundant in Earth's atmosphere? a) Oxygen b) Nitrogen 4) What type of mirrors used in Cars headlights? a) Convex b) Concave 5) What is the process by which plants make their own food using sunlight called? a) Photosynthesis b) Radiation

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