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Correct Answer: D) All of these.
Correct Answer: A) 73%, 25%.
Correct Answer: A) Leftover heat and energy from atom formation.
Correct Answer: A) 75% hydrogen; 25% helium.
Correct Answer: D) A guess that could be proved right or wrong.
Correct Answer: D) None of the above.
Correct Answer: B) They are the most simple and easy to form elements.
Correct Answer: B) 13.7 billion years.
Correct Answer: C) When the star's fuel has run out.
Correct Answer: C) Time and Space.
Correct Answer: A) Penzias.
Correct Answer: D) Sun.
Correct Answer: C) Nuclear Fusion.
Correct Answer: C) The total mass of an object remains fixed within a closed system.
Correct Answer: D) All of the above.
Correct Answer: B) Main sequence.
Correct Answer: C) Energy cannot be created or destroyed.
Correct Answer: B) Universe is expanding.
Correct Answer: C) Cosmic Microwave Background Radiation (CMB).
Correct Answer: D) A Cepheid variable.
Correct Answer: C) Uses evidence to explain how the universe started.
Correct Answer: B) An old star collapses in on itself.
Correct Answer: B) The Big Bang.
Correct Answer: C) Theory.
Correct Answer: A) Dense.