The following is what kind of reaction?
2 CH4 +4 02 → 2 CO2 + 4H2O

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat

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?

Categorize them by metal, nonmetal, in periodic tableductilenon-ductilemalleableoften gain electrons easilygood conductorpoor conductorcan be liquidselements