Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is [SEP] A. balance. [SEP] B. friction. [SEP] C. gravity. [SEP] D. size.

Answer: B


Which of these provides the best evidence that the environment of Earth has changed over millions of years? [SEP] A. active migration of sand dunes [SEP] B. polished appearance of rock surfaces [SEP] C. marine fossils found in mountains [SEP] D. bones of animals found on the ground

Answer: C


Which physical characteristic do some organisms have that helps them survive in the Arctic? [SEP] A. growing tall to hide in trees [SEP] B. changing fur color to hide from predators [SEP] C. developing large paws to protect themselves from the wind [SEP] D. producing shallow root systems to protect themselves from the cold air

Answer: B


Which of the following occurs during photosynthesis? [SEP] A. CO2 is used to produce water. [SEP] B. CO2 is absorbed by mitochondria. [SEP] C. CO2 and H2O are converted to carbohydrates. [SEP] D. CO2 and H2O are combined into carbonic acid.

Answer: C


A common characteristic of all living things is that they [SEP] A. breathe air. [SEP] B. walk upright. [SEP] C. are made of cells. [SEP] D. use sunlight for growth.

Answer: C


In the solar system, moons orbit planets. Which of these do planets orbit? [SEP] A. the Sun [SEP] B. Halley's comet [SEP] C. the asteroid belt [SEP] D. a black hole

Answer: A


Visible light is which type of wave? [SEP] A. seismic [SEP] B. mechanical [SEP] C. longitudinal [SEP] D. electromagnetic

Answer: D


In some national parks, controlled fires are maintained by firefighters. Which of these is one of the major reasons for using controlled burns to maintain certain ecosystems? [SEP] A. to give nonnative plants a chance to colonize the region [SEP] B. to prevent the spread of pests that cause damage to plants [SEP] C. to replace matured plants with saplings of the same species [SEP] D. to rid the forest floor of accumulated deadwood and brush

Answer: D


Which of the following actions is most likely part of a test to find the hardness of a mineral sample? [SEP] A. heating the sample on a hot plate [SEP] B. scratching the sample with a nail [SEP] C. hitting the sample with a hammer [SEP] D. shining a bright light on the sample

Answer: B


In Costa Rica a small tree, the acacia, provides shelter and food for ants. The ants protect the acacia by removing other insects and vines that might harm it. Which term best describes the relationship between the acacia and the ants? [SEP] A. competition [SEP] B. mutualism [SEP] C. parasitism [SEP] D. predation

Answer: B


A car skids along the road and smoke appears to be coming from under the tires. The heat that produces the smoke is caused by [SEP] A. magnetism [SEP] B. sound [SEP] C. light [SEP] D. friction

Answer: D


A glacier sometimes leaves behind large chunks of ice. What is left in the ground when these chunks of ice melt? [SEP] A. a valley [SEP] B. a kettle [SEP] C. a crater [SEP] D. a sinkhole

Answer: B


A student uses a high-efficiency gasoline lawnmower to cut grass. The term "high efficiency" is used to indicate that the lawnmower [SEP] A. cuts better than other lawnmowers. [SEP] B. is easier to use than other lawnmowers. [SEP] C. uses less energy than other lawnmowers. [SEP] D. requires more fuel than other lawnmowers.

Answer: C


Which example would result in new cells that are most different from the parent cells? [SEP] 1. yeast cells splitting into new cells [SEP] 2. bacteria cells dividing into new cells [SEP] 3. skin cells dividing to produce more skin cells [SEP] 4. sperm and egg cells uniting to produce fertilized egg cells

Answer: 4


A dog gets the energy it needs to run from ___. [SEP] A. the air [SEP] B. the Sun [SEP] C. food [SEP] D. water

Answer: C


Certain flowers will open for twelve hours and then close. Which stimulus do the flowers respond to when they open and then when they close for that time period? [SEP] A. light levels [SEP] B. moon phases [SEP] C. seasonal temperatures [SEP] D. carbon dioxide levels

Answer: A


Smoking harms the body in many ways. It is most harmful to which organ? [SEP] A. lung [SEP] B. kidney [SEP] C. liver [SEP] D. stomach

Answer: A


In 1609, Galileo Galilei used lenses to construct the first telescope. His telescope allowed him to observe many objects in space. His invention of the telescope and the data he gathered directly contributed to the understanding that [SEP] A. Earth is the center of the universe. [SEP] B. the planets revolve around the Sun. [SEP] C. all stars eventually explode. [SEP] D. the universe has many galaxies.

Answer: B


The energy obtained from food is measured in units called [SEP] 1. watts [SEP] 2. Calories [SEP] 3. degrees [SEP] 4. pounds

Answer: 2


Which part of the body works closely with the digestive system to transport nutrients to the cells? [SEP] A. lungs [SEP] B. blood [SEP] C. kidneys [SEP] D. esophagus

Answer: B


An example of a learned behavior is [SEP] A. driving a car [SEP] B. having blue eyes [SEP] C. shivering in the cold [SEP] D. breathing air

Answer: A


Iron oxides, such as rust, form when iron metal reacts with oxygen in the air. What are the chemical symbols for the two elements found in iron oxide? [SEP] A. I and O [SEP] B. Ir and O [SEP] C. Fe and O [SEP] D. Pb and O

Answer: C


When water evaporates from Earth's surface into the atmosphere, its molecules enter the gas state. What change in this gas causes molecules to condense into the small water droplets that form clouds? [SEP] A. The mass is reduced. [SEP] B. The volume is increased. [SEP] C. The temperature is reduced. [SEP] D. The pressure is increased.

Answer: C


Which process directly adds carbon into the atmosphere? [SEP] A. increasing plant populations [SEP] B. decreasing animal populations [SEP] C. burning fossil fuels [SEP] D. forming sedimentary rock

Answer: C


Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis? [SEP] A. They swim the same way. [SEP] B. They eat the same food. [SEP] C. They live in the same area of the ocean. [SEP] D. They have similar anatomies.

Answer: D


A particular organism is able to survive in an environment due to a thick layer of fat beneath its skin. In which situation would the layer of fat most likely be a survival advantage? [SEP] A. swimming in arctic waters [SEP] B. eating large amounts of fish [SEP] C. being preyed upon by other animals [SEP] D. living in an environment with high temperatures

Answer: A