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What is the term for the loss of biodiversity in an ecosystem?
What is the primary source of energy for Earth's climate system?
Which organ regulates blood sugar levels in the body?
Which blood vessels carry blood away from the heart?
Which bird is known for its ability to mimic human speech?
Which vitamin is synthesized by bacteria in the human intestine?
What is the term for a substance that speeds up a chemical reaction?
What is the name of the theory that explains the origin of the universe?
Which part of the digestive system absorbs most nutrients?
What causes tides in the ocean?