*Question*
Q: Although they differ vastly in hardness, pencil lead and diamonds both contain what element? Choices: - graphite - hydrogen - oxygen - carbon A:
**Answer**
carbon

*Question*
Q: What is the ability of an atom to emit, or give off, charged particles and energy from the nucleus? Choices: - magnetism - electrolysis - electromagnetism - radioactivity A:
**Answer**
radioactivity

*Question*
Q: What occurs when organisms acquire and pass on new traits from one generation to the next generation? Choices: - variation - birth - phenomenon - evolution A:
**Answer**
evolution

*Question*
Q: What is a sheet of muscle that spreads across the bottom of the rib cage? Choices: - cartilage - thorax - diagram - diaphragm A:
**Answer**
diaphragm