Oxygen by itself is not harmful; , it can become harmful when combined with carbon. * 1 point
however
for instance
in summary
namely

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?