*Question*
Q: Two events are defined to be simultaneous if an observer measures them as occurring at what? Choices: - midnight - opposite times - different times - same time A:
**Answer**
same time

*Question*
Q: What kind of membrane do prokaryotic cells have? Choices: - cell wall - cellulose - plasma wall - plasma membrane A:
**Answer**
plasma membrane

*Question*
Q: What two substances do plants give off when they make food? Choices: - water and oil - carbon dioxide and oxygen - chlorophyll and nitrogen - oxygen and water A:
**Answer**
oxygen and water

*Question*
Q: Solar cells turn sunlight directly into what? Choices: - gas - water - cold - electricity A:
**Answer**
electricity