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Question
Oxygen (
) isA) a gas which principally originates from volcanic sources.
B) a by-product of photosynthesis.
C) one of the gases from Earth's earliest atmospheres.
D) now measured at 78.084% by volume in the homosphere.
Answer
This answer is hidden. It contains 1 characters.
Related questions
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The key idea behind the scientific method is
A) the use of intuition in testing theories.
B) an appeal to supernatural explanations when natural explanations have not yet been found for a phenomenon.
C) the testing of ideas through controlled observations and experiments.
D) unbridled speculation about the world.
Q:
Which of the following is the most strongly supported by experimental and observational evidence?
A) speculation
B) hypothesis
C) educated guess
D) theory
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In order to study the planetesimal hypothesis, astronomers study this process in other parts of the Galaxy.
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The Milky Way is about 100,000 light-years from side to side.
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The Solar System, Sun, and Earth formed about 4.6 billion years ago.
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Which of the following is true of the biosphere?
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