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As the Universe Cooled, It Eventually Reached a Temperature of 3,000

Question 7

Multiple Choice

As the universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as


A) ionization.
B) isotropy.
C) annihilation.
D) recombination.
E) hydration.

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