Select all the correct answers. Which substances are made up of polymers?
O
O
O
O
DNA
a glass bottle
ice crystals
the proteins in hair
rubber car tires
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Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?

Why dose heating increase the speed at which a solution dissolved in water

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.