*Question*
Q: What is made by trees and other plants during photosynthesis? Choices: - methane - carbon dioxide - nitrogen - oxygen A:
**Answer**
oxygen

*Question*
Q: The waves on the strings of musical instruments are transverseso are electromagnetic waves, such as visible light. sound waves in air and water are this? Choices: - symmetrical - hydroelectric - horizontal - longitudinal A:
**Answer**
longitudinal

*Question*
Q: The measure of how much a given volume of matter decreases when placed under pressure is called? Choices: - elasticity - solubility - malleability - compressibility A:
**Answer**
compressibility

*Question*
Q: Methane, ethane, and propane are three of the smallest what? Choices: - organisms - atoms - microorganisms - alkanes A:
**Answer**
alkanes