Q: The ordovician-silurian extinction event is the first recorded mass extinction and the second largest. during this period, about what percent of marine species went extinct? Choices: - 10 percent - 99 percent - 40 percent - 85 percent A:
85 percent

Q: Gases are most ideal at high temperature and what pressure? Choices: - absolute - high - stable - low A:
low

Q: Q: A fish's stream-lined body that reduces water resistance is an example of what kind of response to an aquatic lifestyle? Choices: - natural selection - retraction - evolution - adaptation A:
A: adaptation

Question: Q: What type of waves start when a source of energy causes a disturbance in the medium? Choices: - fluid waves - mechanical currents - magnetic waves - mechanical waves A:
Answer: mechanical waves

*Question*
Q: What are the most dramatic, sudden, and dangerous types of mass wasting? Choices: - earthquakes - monsoons - volcanoes - landslides A:
**Answer**
landslides

*Question*
Q: What creates charged regions in a water molecule? Choices: - nonpolar bonds - ionic bonds - noncovalent bonds - polar covalent bonds A:
**Answer**
polar covalent bonds