Select from:
i. germs
ii. safe
iii. energy
iv. pure
v. harmful
vi. dangerous
vii. wet
viii. heat
Given those answer options, answer the question: Fact 1: Treating water is used to remove harmful substances before drinking. Fact 2: Boiling is the most reliable way to treat contaminated water. Given the two facts above, boiling can make water less what to drink?
A:
v.