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    Horizons Exploring the Universe
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    Exam 20: Astrobiology: Life on Other Worlds
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    As Far as We Know All Forms of Life on Earth
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As Far as We Know All Forms of Life on Earth

Question 74

Question 74

Multiple Choice

As far as we know all forms of life on Earth use ____________ as a medium for chemical reactions.


A) gaseous helium
B) Gaseous Helium
C) frozen carbon dioxide
D) liquid water
E) frozen water

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