Q: What causes nitrate to go back to its gaseous nitrogen state? Choices: - phytoflagellate bacteria - decomposers - enzymes - denitrifying bacteria A:
denitrifying bacteria

Q: The orbicularis oris is a circular muscle that moves the lips, and the orbicularis oculi is a circular muscle that does what? Choices: - pressure the eye - opens the eye - moisturizes the eye - closes the eye A:
closes the eye

Q: What is an isotope that is radioactive called? Choices: - isotopes - matured isotope - radionuclides - radioisotopes A:
radioisotopes

Q: Enzymes in the stomach and small intestine break down proteins into what components? Choices: - atoms - antioxidants - lactic acids - amino acids A:
amino acids