Many plants are poisonous to varying different degrees, though perhaps water hemlock’s root would be the most likely to kill a human, a small mouthful being sufficient
Environment
Environment
Science
Why is carbon monoxide poisonous?
Carbon monoxide (CO) is a poisonous, colourless, odourless and tasteless gas, which is formed when there is not enough oxygen present when carbon-based fuels such as wood and oil are burnt (ie incomplete combustion)