Ques:Q: Unlike pure substances, mixtures have a what? Choices: - efficient composition - unique composition - complex composition - variable composition A:

Ans:variable composition
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Ques:Q: Quantum chromodynamics combines what property with quark theory? Choices: - mass - contrast - sound - color A:

Ans:color
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Ques:Q: What occurs when the immune system is not working properly? Choices: - allergy - cancer - anemia - immunodeficiency A:

Ans:immunodeficiency
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Ques:Q: How long does membrane depoloriazation typically last for? Choices: - 1 hour - 3 seconds - 5 minutes - one minute A:

Ans:
one minute
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