*Question*
Q: The burning of what type of fuels is a major source of sulfur oxides and nitrogen oxides? Choices: - biofuels - renewable - synthetic - fossil A:
**Answer**
fossil

*Question*
Q: What do you call the patterns and groups of stars in the sky that ancient people observed and made stories about? Choices: - planets - meteors - asteroid fields - constellations A:
**Answer**
constellations

*Question*
Q: What is the primary gas produced from burning of wood? Choices: - liquid dioxide - Hydrogen Dioxide - toxic dioxide - carbon dioxide A:
**Answer**
carbon dioxide

*Question*
Q: Chordates are defined by a set of four characteristics that are shared by these animals at some point during their? Choices: - death - response - birth - development A:
**Answer**
development