*Question*
Q: Does overhead irrigation or drip irrigation use less water? Choices: - mist irrigation - stream irrigation - constant flow - drip irrigation A:
**Answer**
drip irrigation

*Question*
Q: Lack of what mineral causes rickets? Choices: - zinc - potassium - magnesium - calcium A:
**Answer**
calcium

*Question*
Q: What is the name of the line used in topographic maps that shows different elevations? Choices: - a patch line - a crater line - a curve line - a contour line A:
**Answer**
a contour line

*Question*
Q: What is the study of the similarities and differences in the embryos of different species? Choices: - example embryology - prenatal biology - diversified embryology - comparative embryology A:
**Answer**
comparative embryology