*Question*
Q: Engaging in relatively simple behaviors helps maintain a nearly constant body temperature for organisms classified as what? Choices: - photophores - placoderms - endotherms - ectotherms A:
**Answer**
ectotherms

*Question*
Q: Natural gas burns cleaner and produces less carbon dioxide than fuels of what type? Choices: - renewable fuels - solar energy - biofuels - fossil fuels A:
**Answer**
fossil fuels

*Question*
Q: Static friction acts on objects when they are resting on what? Choices: - a single point - their laurels - a pool of water - a surface A:
**Answer**
a surface

*Question*
Q: In a hydrogen replacement reaction, the hydrogen in the acid is replaced by what? Choices: - gas - water - oxygen - an active metal A:
**Answer**
an active metal