*Question*
Q: What part of an experiment or other investigation consists of the individuals or events that are studied? Choices: - hypothesis - experimental control - independent variable - sample A:
**Answer**
sample

*Question*
Q: Fish have a circulatory system with a two-chambered what? Choices: - brain - lung - stomach - heart A:
**Answer**
heart

*Question*
Q: What concentrates wave energy or disperses it? Choices: - wave diffusion - a prism - wave reflection - wave refraction A:
**Answer**
wave refraction

*Question*
Q: What occurs when a cold air mass runs into a warm air mass? Choices: - an occluded front - a stationary front - a snow day - a cold front A:
**Answer**
a cold front