Q: Q: What is something that all machines must overcome? A: | OPTIONS:
- stress
- work
- temperature
- friction
A: friction

Q: Q: What natural part of the water cycle can cause damage and death? A: | OPTIONS:
- clouds
- evaporation
- expiration
- floods
A: floods

Q: Q: The crocodilia order, which includes crocodiles, alligators, caimans, and gharils, is part of what class of animals? A: | OPTIONS:
- aquatic
- mammals
- parasites
- reptiles
A: reptiles

Q: Q: Conductivity, oxidation state and physical appearance are properties that help determine whether what are metals? A: | OPTIONS:
- atoms
- phases
- organisms
- elements
A: elements