*Question*
Q: What part of the plant holds the plant upright? Choices: - roots - leaves - notochord - the stem A:
**Answer**
the stem

*Question*
Q: What kind of power does not produce any pollutants, but produces waste that can be difficult to dispose of? Choices: - electrical - biofuel - solar - nuclear A:
**Answer**
nuclear

*Question*
Q: All planets exhibit the same or nearly the same direction and shape of what path around the sun? Choices: - revolution - ellipse - nucleus - orbit A:
**Answer**
orbit

*Question*
Q: The depth of the atmosphere is greatest where? Choices: - under water - the ionosphere - the stratosphere - sea level A:
**Answer**
sea level