What is the hardest natural substance on Earth?, water, diamond, concrete, crystal, How many bones are in the adult human body?, 204, 205, 206, 207, What is the largest planet in our solar system?, earth, mars, saturn, jupiter, What is the chemical formula for water?, H₂O, h₂o, OH₂, H₂o, What is the first name of the scientist who discovered oxygen in 1774?, Freddy, Rosa, Johnny, Joseph, What is the largest organ in the human body?, heart, lungs, stomach, skin, What substance gives plants their green color?, Chlorophyll, cytoplasm, mitochondria, What is the name of the process by which plants make their food?, respirstion, photosynthesis, nfvjeoaqcvbdjiqo, idk, How many chambers are in the human heart?, 6, 7, 4, 5, What is the most abundant gas in Earth's atmosphere?, water, oxygen, nitrogen, carbon dioxide.

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