*Question*
Q: The purpose of scientific investigations generally is to test a what? Choices: - theory - question - suggestion - hypothesis A:
**Answer**
hypothesis

*Question*
Q: What do you call any device that makes work easier by changing a force? Choices: - technology - invention - battery - machine A:
**Answer**
machine

*Question*
Q: The wave on a guitar string is transverse. the sound wave rattles a sheet of paper in a direction that shows the sound wave is what? Choices: - obtuse - lateral - magnetic - longitudinal A:
**Answer**
longitudinal

*Question*
Q: Proteins are one of four classes of what type of compounds? Choices: - hormonal - genetic - synthesized - biochemical A:
**Answer**
biochemical