Which of These Easily Observed Molecular Species Is Used as a Tracer

question 36

Multiple Choice

Which of these easily observed molecular species is used as a tracer for the fundamental but difficult to observe H₂ molecules in giant molecular clouds?

• A) hydroxyl (OH)
• B) water vapor (H₂O)
• C) carbon dioxide (CO₂)
• D) carbon monoxide (CO)

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