The nightshade family of plants includes more than 2000 species of herbs, shrubs, and small trees. Plants with edible parts include the potato, tomato, eggplant, and red pepper. Some nightshade members such as jimsonweed and belladonna contain poisonous substances. Tobacco and petunias are also in the nightshade family.
Which of the following most accurately describes the entire group of plants in the nightshade family?

• A. edible plants
• B. no agriculturally important plants
• C. poisonous plants
• D. a large variety of species
• E. no economically important species

An iceberg is slightly less dense than seawater and, therefore, floats with a fraction of its mass (about one-eighth to one-fifth) above the water. The other much greater portion is underwater. Irregularities in the shape of the iceberg determine how much is actually submerged.
Icebergs vary greatly in size and can present a great hazard to ships. Large icebergs are usually easy to detect on a ship's radar and, therefore, can be avoided.
Which statement is most important for a captain to recall when navigating a ship through an iceberg field?

• A. Icebergs melt slowly.
• B. Smaller icebergs are not a threat to big ships.
• C. Major portion of each iceberg is under water.
• D. Icebergs occur in clusters of ten or more.
• E. Dangerous currents and eddies can surround an iceberg.

What behaviors do birds use for navigation?

• A. only innate behavior
• B. only following the leader
• C. both innate and learned behavior
• D. only learned behavior
• E. both training and following the leader

Students in a biology class were asked to construct hypotheses about the relationship between air temperature and the number of times crickets chirp per minute. They listened to a tape of crickets chirping at six different temperatures. The students counted the number of chirps per minute and recorded their results, which are shown in the table below.

Which statement best describes the relationship between the number of chirps and the air temperature?

• A. As the temperature decreases, the number of chirps increases.
• B. There is no relationship between the number of chirps and the temperature.
• C. As the temperature increases, the number of chirps increases.
• D. The crickets will not chirp at 0(degrees) F.
• E. The crickets will not chirp when the temperature is above 81(degrees) F.

A liquid's boiling point is the temperature at which the pressure of its escaping vapor is equal to the atmospheric pressure.
Reduced pressure on the surface of a liquid results in a reduction in the vapor pressure needed for boiling to occur. At higher elevations, thinner air causes a reduction in atmospheric pressure, and liquids boil at lower temperatures.
At lower elevations, the atmospheric pressure is higher, and liquids boil at higher temperatures.

If Diane boiled water for coffee while camping in the mountains, which statement best describes what would happen to the water?

• A. change to steam before it had a chance to boil
• B. boil at the same temperature as it would at a lower elevation
• C. not boil at the high elevation in the mountains
• D. boil at a lower temperature than it would at a lower elevation
• E. boil at a higher temperature than it would at a lower elevation