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a unsaturated hydrocarbon is called what?

ALL plastics are made from polymers?

we can design smart polymers to do what?

emulsifiers have what?

a process that lowers the melting point of oil is called?

the most outer layer of the earth is called what?

what is the most abundant gas in the earths atmosphere

as plants spred across the earth what happend?

crude oil is a element?

how do we get the fractions from crude oil?