Distilled water is purified by A. adding purification tablets.
B. filtering.
C. reverse osmosis.
D. heating it until it becomes a vapor and then cooling it until it becomes a liquid.

The answer is D! the warmth is what purify’s it

Agroup of engineering students from purdue university reported that its licking machine, modeled after a human tongue, took an average of 364 licks to get to the center of a tootsie pop. twenty of the group's volunteers assumed the licking challenge-unassisted by machinery-and averaged 252 licks each to the center.