Which statements are true regarding the scientific evidence supporting the big bang theory?
A-Researchers found cosmic microwave background radiation, which is a heat imprint left over from the big bang.
B-Quasars have been observed exploding and expanding from a single, hot, dense singularity.
C - primordial form of helium gas was found by the Endeavor space shuttle.
D - redshift of light emitted by stars and galaxies indicates the universe is expanding.
E-Redshift and blueshift of light emitted by stars and galaxies indicate that universe is expanding and contracting.
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