Q: Q: These microorganisms are abundant in the human digestive track and serve many roles. what are they? Choices: - antioxidants - pathogens - tumors - bacteria A:
A: bacteria

Q: Q: Urea and carbon dioxide are molecules with how many carbon atoms? Choices: - even number - four - two - one A:
A: one

Q: Q: What's the name for an atom that has gained or lost an electron? Choices: - an photon - isotope - neutrino - an ion A:
A: an ion

Q: Q: Endoscopes are used to explore the body through various orifices or these? Choices: - dermal tears - major incisions - ocular cavity - minor incisions A:
A: minor incisions