*Question*
Q: Which veins return oxygen-rich blood from the lungs to the heart? Choices: - jugular - varicose - respiratory - pulmonary A:
**Answer**
pulmonary

*Question*
Q: How does consuming enterobactin help our body? Choices: - builds excess iron - eliminates excess fat - eliminates excess oxygen - eliminates excess iron A:
**Answer**
eliminates excess iron

*Question*
Q: When food enters the stomach after a period of fasting, a drop in what initiates the conversion of pepsinogen to pepsin? Choices: - calcium - white blood cells - acid - ph A:
**Answer**
ph

*Question*
Q: Where do streams often start? Choices: - valleys - oceans - plains - mountains A:
**Answer**
mountains