Given the question: Fact 1: Carbon monoxide is a gas produced by furnaces and other devices that burn fuel. Fact 2: Excessive accumulation build-up of carbon monoxide can cause suffocation. Given the two facts above, answer the question "What can gas furnaces cause?" with the following options: - matter vibrating - Pollution - rain - Stale air - condensation - emissions - suffocation - friction
The answer is:
suffocation