Answer:
Global warming, also known as Climate Change, means the rise in average surface temperatures on Earth. An overwhelming scientific consensus maintains that climate change is due primarily to the human use of fossil fuels, which releases carbon dioxide and other greenhouse gases into the air.
Explanation:
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A is correct. Catalysts are substances that accelerate a chemical reaction, and enzymes are catalysts that increase the rate in cellular reactions.
Many scientists agree that the universe is about 13 billion years old.