*Question*
Q: A period is a horizontal row of the what? Choices: - cycles table - phases table - species table - periodic table A:
**Answer**
periodic table

*Question*
Q: Which organ system defends the body from pathogens and other causes of disease? Choices: - digestion system - nervous system - respiratory system - immune system A:
**Answer**
immune system

*Question*
Q: What evolutionary process does not favor altruistic behavior that causes the death of the altruist? Choices: - flow selection - characteristic selection - random selection - natural selection A:
**Answer**
natural selection

*Question*
Q: Arachidic, stearic, and palmitic fatty acids are examples of what type of fatty acid? Choices: - neutral - integral - compacted - saturated A:
**Answer**
saturated