An astronomical unit (AU) refers to the distance between OPTIONS:
- Earth and the Sun.
- the Moon and the Sun.
- Earth and the Moon.
- the Sun and the nearest star.
A: Earth and the Sun.

Since 1961, Nevada has led the United States in production of which resource? OPTIONS:
- gold
- uranium
- lumber
- iron
A: gold

Which of these is unique to the process of scientific investigation? OPTIONS:
- observing an event as it occurs
- discussing results with other experts
- publishing the results on a webpage
- collecting data in an experiment
A: collecting data in an experiment

Which biological process determines the probability that particular alleles will be found in any given gamete? OPTIONS:
- mutation
- meiosis
- cell cycle
- protein synthesis
A:
meiosis