Order the following from most recent to least. I. Big Bang II. Age of quasars III. First humans IV. Cambrian explosion V. Formation of the solar system VI. First life VII. Recombination Period
a. I, II, VII, IV, V, VI, III b. I, VI, VII, II, V, IV, III
c. I, VI, V, VII, III, II, IV d. I, VII, II, V, VI, IV, III
Question 2
In units of yards, how far from the Big Bang is the Recombination period, when the gas becomes transparent to light?
a. much, much less than a yard b. about a yard
c. about 5 yards d. about 10 yards
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