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The current proportions of Hydrogen and Helium (assumed to be comparable to the ancient ones) tell...

The current proportions of Hydrogen and Helium (assumed to be comparable to the ancient ones) tell us what about the early universe?

a)The temperature of the Planck era.

b)Where the big bang occurred.

c)Why there is no antimatter.

d)How long some of the eras lasted in comparison to others.

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