Which is most common safety rule to follow before leaving the lab

What does it mean for a cell membrane to be selectively permable

What part of the brain is highlighted in the diagram below?

Match the pollutants. 1. a chlorofluorocarbon smoke 2. a biodegradable organophosphate insecticide freon 3. particle pollution paint 4. hazardous waste monoxide 5. carbon is completely burned malathion 6. carbon is incompletely burned dioxide