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Answer: Nitrogen
Nitrogen makes up approximately 78% of the Earths atmosphere, followed by oxygen at about 21%.
Answer: To fight infection
White blood cells are part of the immune system and defend the body against pathogens like bacteria and viruses.
Answer: Femur
The femur is the largest and strongest bone in the human body, located in the thigh.
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Answer: Oxygen
Oxygen is essential for cellular respiration, where cells generate energy by using oxygen to break down glucose.
Answer: CO2
Carbon dioxide consists of one carbon atom and two oxygen atoms, with the formula CO2.
Answer: Protecting vital organs
The skeletal system provides structural support and protection for vital organs, like the brain, heart and lungs.
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Answer: Lithium
Lithium is commonly used in rechargeable batteries, especially for portable electronics and electric vehicles.
Answer: Nucleus
The nucleus is the central part of an atom, containing protons and neutrons.
Answer: Atom
The atom is the smallest unit of matter that retains the properties of an element.
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Answer: Melting ice
Melting ice is a physical change because the ice changes from solid to liquid without altering its chemical composition.
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