A toxic biological substance or disease-causing organism that is hazardous to the health of people is a biohazard.
Helium (from Greek: ἥλιος, translit. Helios, lit. 'Sun') is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements.
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An unwanted physical or mental effect caused by a drug
