Q: Individuals with sickle cell anemia have crescent-shaped what? Choices: - glial cells - white blood cells - nerve cells - red blood cells A:
red blood cells

Q: What involuntary muscle is found only in the heart? Choices: - physiological muscle - respiratory muscle - digestive muscle - cardiac muscle A:
cardiac muscle

Q: What is the lightest molecule? Choices: - oxygen - helium - silicon - hydrogen A:
hydrogen