A teacher gives a student four clear sealed containers. Each container holds a different substance. The student records some observations about the substance in each container. Based on these observations, which container most likely holds only gas? (5.5A)

A farmer keeps bees to pollinate crops. The farmer makes several observations about the bees. Which of these observations describes a learned behavior? (5.10B)

A group of students built the circuit shown here. The lightbulb does not glow. Which statement explains this observation? (5.6B)

The whiskers of a river otter and the antennae of a cockroach are shown here. How do structures such as whiskers and antennae benefit organisms? (5.10A)

A student looks into a mirror and sees an image of an object. Which diagram shows an X where the object is most likely located? (5.6C)

Some students investigate the properties of four objects using a hand lens, a magnet, and a beaker containing water. Their observations are recorded in the table. Which statement identifies a property that could be used to classify these objects into two different groups? (5.5A)

An African savanna is a grassland with shrubs and a few small trees. It has warm temperatures all year long, a dry winter season, and a rainy summer season. Which group of animals is most likely supported by an African savanna? (3.9A)

Some characteristics of objects in the solar system are listed in the table. Which of the listed characteristics describe both Earth and the moon? (5.8D)

The table lists ways that four organisms obtain energy. Which organism obtains energy without depending on another organism? (5.9A)

A student observed liquid wax dripping down the side of a burning candle. After putting out the candle's flame, the student left the room. Several hours later the student observed that there was no longer any liquid on the side of the candle. Which statement explains what most likely happened to the liquid wax? (3.5C)

A student adds 10 grams of four different powdered solids into four different beakers. The student then adds 100 mL of water to each beaker, stirs the mixtures, and allows them to sit for half an hour before recording observations. Which question is the student most likely trying to answer with this investigation? (5.5C)

Many types of fans are used in homes. One type of electric fan is shown below. In addition to mechanical energy, which of these is produced as electric current passes through the circuit of this fan? (5.6A)

A freshwater ecosystem has various food webs. One of these food webs is shown here. Which organisms transfer the most energy within the food web? (5.9B)

A student draws diagrams of her house and the location of the sun in the sky. Which diagram does not correctly represent the location of the sun at the time indicated? (5.8C)

The diagram shows a fish being viewed from above the water. The fish appears to be closer to the surface than it really is. What causes this difference? (5.6C)

Fossil fuels formed over long periods of time after particles in water settled to the sea floor and formed marine mud. What kinds of particles needed to be present in the marine mud in order for fossil fuels to form? (5.7A)

The table lists the preferred diet of several types of birds. Based on this information, which two types of birds do not compete for food resources? (5.9A)

The photograph shows a canyon in northern Arizona. Which of these describes how this canyon was most likely formed? (5.7B)

A student classifies the objects shown based on their physical properties. Which property cannot be used to classify these objects into more than one group? (5.5A)

A simplified diagram of a system using solar energy is shown. To recharge the battery for later use without lighting the bulb, which of the following switches should be closed? (5.6B)

Resources can be classified as renewable or nonrenewable. Which of these resources is classified in the same category as coal? (4.7C)

A student observes the following activities while walking in a park. Which of these living organisms was interacting with another living organism in the environment? (5.9A)

A scientist was studying a type of event that occurred on Earth in various places within a 30-day period. The circles indicate where the events happened. The events being studied involved rapid changes to Earth's surface at the locations shown on the map. What type of event do the circles on the map most likely represent? (3.7B)

A science class tested three properties of different materials. The results are shown in the table. Based on the table, which material would be best to use to insulate electrical wires? (5.5A)

The nesting habits of four types of birds are described in the table. If all the dead branches and dying trees in a wooded area are removed, which bird's nesting habit would be most affected? (5.9C)

A student designs an experiment to test the effects of the width of a piece of elastic on the elastic's ability to stretch. The student selects four pieces of elastic with different widths but the same length. The student then attaches blocks with different masses to the pieces of elastic. The results of the student's experiment are shown. What should the student do to improve this experiment? (5.6D)

A food web for some organisms in an African rain forest is shown below. Which organisms in this food web eat only consumers? (5.9B)

A student is looking for evidence that Earth is always rotating on its axis. Which of the following would provide the best evidence? (5.8C)

Some animals, such as lions, have pointed teeth, while other animals, such as cattle, have flat teeth. The difference in the shape of these animals' teeth is most closely related to--- (5.10A)

In 1859, Henry Bursill published a book of hand shadows. The picture shows one of these hand shadows. Which property of light makes it possible to produce hand shadows? (5.6C)

Some species of rain forest frogs reproduce in the moist leaf litter on the forest floor. These frogs do not need a nearby body of water to complete their life cycle. Which stage of the typical frog life cycle is most likely missing from their life cycle? (3.10B)

When a bat searches for prey at night, it makes sounds as it flies, and it uses the sounds' echoes to find its prey. When the bat flies and listens to echoes to locate prey, it is using---(5.6A)

A wide U-shaped valley is shown in the photograph. This valley was most likely formed by-- (5.7B)

A group of students made the observations listed in the table about the size, shape, and appearance of their hands. Which of the students' observations describe inherited traits? (5.10B)

Some people add sugar to their hot tea. Which property of the sugar remains the same when the sugar is in the tea solution? (5.5C)

Four students stand facing a box. The diagram below shows an overhead view of the box. The numbered circles represent the positions of the students. What do the students need to do to slide the box to the northeast? (3.6B)

Some students make a model to show one of the first steps in the formation of sedimentary rock. The students pour 2 centimeters of light-colored sand into a clear plastic box. Then they add 1 centimeter of gravel. Finally they pour 2 centimeters of dark-colored sand on top of the gravel. Which characteristic of sedimentary rock does this model best show? (5.7A)