Select the correct answer from each drop-down menu. Complete the statements about the nature of scientific knowledge.

Among the different types of scientific knowledge, [ ] are likely to be modified or discarded most frequently. Long ago, in the 1600s, scientists discarded the phlogiston theory because [ ]
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You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices