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Based on the experiment with liquid oxygen and nitrogen, the claim best supported by evidence is Claim 2: Some of the liquid oxygen evaporated in tank 3.
In tank 3, the mixture of liquid nitrogen and oxygen is heated a little so that Nitrogen will escape seeing as it has a lower boiling point.
It is however possible that some oxygen escaped at the same time because gas particles can evaporate at a temperature below their boiling point if they have enough energy so some oxygen might have escaped when the boiling gave enough energy.
In conclusion, claim 2 is the best supported option.
Find out more on boiling points at https://brainly.com/question/7468687.