*Question*
Answer the following question given this paragraph: Stems hold plants upright, bear leaves and other structures, and transport fluids between roots and leaves. Like roots, stems contain dermal, ground, and vascular tissues. Trees have woody stems covered with bark. Q: What part of the plant holds the plant upright? Choices: - roots - leaves - notochord - the stem A:
**Answer**
the stem

*Question*
Answer the following question given this paragraph: Nuclear power is a controversial subject in California and most other places. Nuclear power has no pollutants including no carbon emissions. However, power plants are not always safe. The long-term disposal of wastes is a problem that has not yet been solved. The future of nuclear power is murky. Find out more at: http://science. kqed. org/quest/audio/new-nuclear/. 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*
Answer the following question given this paragraph: To figure out how the solar system formed, we need to put together what we have learned. There are two other important features to consider. First, all the planets orbit in nearly the same flat, disk-like region. Second, all the planets orbit in the same direction around the Sun. These two features are clues to how the solar system formed. 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*
Answer the following question given this paragraph: The depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes. With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude. On top of Mount Everest, which is the tallest mountain on Earth, air pressure is only about one-third of the pressure at sea level. Q: The depth of the atmosphere is greatest where? Choices: - under water - the ionosphere - the stratosphere - sea level A:
**Answer**
sea level