*Question*
Q: What term describes a collection of similar cells that had a common embryonic origin? Choices: - organ-level organization - plasma - nucleus - tissue A:
**Answer**
tissue

*Question*
Q: What is the term for the change in temperature with distance? Choices: - heat gradient - distance gradient - temperature volatility - temperature gradient A:
**Answer**
temperature gradient

*Question*
Q: Limestone is insoluble in water, so what can dissolve it? Choices: - calcium - dioxide - oxygen - acid A:
**Answer**
acid

*Question*
Q: Geysers erupt because what boiling hot substance is trapped beneath their surface? Choices: - gas - lava - oil - water A:
**Answer**
water