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Which is the first step in a design process?
[ "Revise the solution.", "Describe the problem.", "Test the possible solutions.", "Identify possible solutions." ]
B
train
null
ai2_arc_ARC-Easy
What type of chemical reaction occurs when the body breaks down fats and sugars that supply it with energy?
[ "endothermic", "exothermic", "electrical", "physical" ]
B
train
null
ai2_arc_ARC-Easy
Intense heat and pressure in Earth's crust can change sandstone into quartzite. During this metamorphosis, many properties of these rocks change. Which property of these rocks will most likely remain the same?
[ "mass", "volume", "crystal structure", "particle shape" ]
A
train
null
ai2_arc_ARC-Easy
How do decomposers obtain their food?
[ "hunting and killing prey for food", "changing carbon dioxide and water into food", "absorbing food from dead organisms", "producing food from oxygen and sunlight" ]
C
train
null
ai2_arc_ARC-Easy
A ball on a cart is moving at a rate of 2 m/s. The cart suddenly stops and the ball continues to travel in the same direction at the same speed. This is an example of the
[ "law of gravity.", "first law of motion.", "second law of motion.", "third law of motion." ]
B
train
null
ai2_arc_ARC-Easy
Why is it important to have a large sample size in an investigation?
[ "to be able to compare results", "to increase the validity of the data", "to form the best conclusion", "to ensure the procedure is followed" ]
B
train
null
ai2_arc_ARC-Easy
Burt used a spoon to stir soup that was cooking on his stove. Which spoon will stay the coolest while he stirs?
[ "an iron spoon", "an aluminum spoon", "a wooden spoon", "a silver spoon" ]
C
train
null
ai2_arc_ARC-Easy
Which is a distinction between an epidemic and a pandemic?
[ "the symptoms of the disease", "the geographical area affected", "the species of organisms infected", "the season in which the disease spreads" ]
B
train
null
ai2_arc_ARC-Easy
When two bumper cars collide, some of the kinetic energy of the cars is transformed. Which form of energy is most likely formed as a result of this collision?
[ "electrical", "electromagnetic", "magnetic", "sound" ]
D
train
null
ai2_arc_ARC-Easy
Which statement describes all matter?
[ "All matter contains carbon.", "All matter contains oxygen.", "All matter is made up of cells.", "All matter is made up of atoms." ]
D
train
null
ai2_arc_ARC-Easy
Carbon dioxide is removed from Earth's atmosphere by
[ "animal respiration.", "decaying organisms.", "plant photosynthesis.", "burning fossil fuels." ]
C
train
null
ai2_arc_ARC-Easy
A water company uses lab tests on the water supply before sending the water through pipes to people's homes. How do these lab tests help people?
[ "by adding minerals and nutrients to the water", "by checking the water to make sure it is safe to drink", "by filtering chemicals and organisms out of the water", "by stopping harmful substances from entering the water" ]
B
train
null
ai2_arc_ARC-Easy
What safety rule is most important for students to follow when working with acids and bases?
[ "wear nose plugs", "put on safety goggles", "put away all lab supplies", "wear heavy cloth gloves" ]
B
train
null
ai2_arc_ARC-Easy
A person in a dark room looking through a window can clearly see a person outside in the daylight. But a person outside cannot see the person inside. Why does this happen?
[ "There is not enough light being reflected off the person in the room.", "Light rays cannot pass through a window twice.", "Outside light does not pass through windows.", "Sunlight is not as intense as other sources of light." ]
A
train
null
ai2_arc_ARC-Easy
Many processes on Earth occur at or near tectonic plate boundaries. Which geological events are most common along tectonic plate boundaries?
[ "erosion and deposition", "hurricanes and tornadoes", "earthquakes and volcanoes", "tidal waves and sedimentation" ]
C
train
null
ai2_arc_ARC-Easy
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
[ "balance.", "friction.", "gravity.", "size." ]
B
train
null
ai2_arc_ARC-Easy
Which of these provides the best evidence that the environment of Earth has changed over millions of years?
[ "active migration of sand dunes", "polished appearance of rock surfaces", "marine fossils found in mountains", "bones of animals found on the ground" ]
C
train
null
ai2_arc_ARC-Easy
Which physical characteristic do some organisms have that helps them survive in the Arctic?
[ "growing tall to hide in trees", "changing fur color to hide from predators", "developing large paws to protect themselves from the wind", "producing shallow root systems to protect themselves from the cold air" ]
B
train
null
ai2_arc_ARC-Easy
Which of the following occurs during photosynthesis?
[ "CO2 is used to produce water.", "CO2 is absorbed by mitochondria.", "CO2 and H2O are converted to carbohydrates.", "CO2 and H2O are combined into carbonic acid." ]
C
train
null
ai2_arc_ARC-Easy
A common characteristic of all living things is that they
[ "breathe air.", "walk upright.", "are made of cells.", "use sunlight for growth." ]
C
train
null
ai2_arc_ARC-Easy
In the solar system, moons orbit planets. Which of these do planets orbit?
[ "the Sun", "Halley's comet", "the asteroid belt", "a black hole" ]
A
train
null
ai2_arc_ARC-Easy
Visible light is which type of wave?
[ "seismic", "mechanical", "longitudinal", "electromagnetic" ]
D
train
null
ai2_arc_ARC-Easy
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?
[ "to give nonnative plants a chance to colonize the region", "to prevent the spread of pests that cause damage to plants", "to replace matured plants with saplings of the same species", "to rid the forest floor of accumulated deadwood and brush" ]
D
train
null
ai2_arc_ARC-Easy
Which of the following actions is most likely part of a test to find the hardness of a mineral sample?
[ "heating the sample on a hot plate", "scratching the sample with a nail", "hitting the sample with a hammer", "shining a bright light on the sample" ]
B
train
null
ai2_arc_ARC-Easy
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?
[ "competition", "mutualism", "parasitism", "predation" ]
B
train
null
ai2_arc_ARC-Easy
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
[ "magnetism", "sound", "light", "friction" ]
D
train
null
ai2_arc_ARC-Easy
A glacier sometimes leaves behind large chunks of ice. What is left in the ground when these chunks of ice melt?
[ "a valley", "a kettle", "a crater", "a sinkhole" ]
B
train
null
ai2_arc_ARC-Easy
A student uses a high-efficiency gasoline lawnmower to cut grass. The term "high efficiency" is used to indicate that the lawnmower
[ "cuts better than other lawnmowers.", "is easier to use than other lawnmowers.", "uses less energy than other lawnmowers.", "requires more fuel than other lawnmowers." ]
C
train
null
ai2_arc_ARC-Easy
Which example would result in new cells that are most different from the parent cells?
[ "yeast cells splitting into new cells", "bacteria cells dividing into new cells", "skin cells dividing to produce more skin cells", "sperm and egg cells uniting to produce fertilized egg cells" ]
D
train
null
ai2_arc_ARC-Easy
A dog gets the energy it needs to run from ___.
[ "the air", "the Sun", "food", "water" ]
C
train
null
ai2_arc_ARC-Easy
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?
[ "light levels", "moon phases", "seasonal temperatures", "carbon dioxide levels" ]
A
train
null
ai2_arc_ARC-Easy
Smoking harms the body in many ways. It is most harmful to which organ?
[ "lung", "kidney", "liver", "stomach" ]
A
train
null
ai2_arc_ARC-Easy
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
[ "Earth is the center of the universe.", "the planets revolve around the Sun.", "all stars eventually explode.", "the universe has many galaxies." ]
B
train
null
ai2_arc_ARC-Easy
The energy obtained from food is measured in units called
[ "watts", "Calories", "degrees", "pounds" ]
B
train
null
ai2_arc_ARC-Easy
Which part of the body works closely with the digestive system to transport nutrients to the cells?
[ "lungs", "blood", "kidneys", "esophagus" ]
B
train
null
ai2_arc_ARC-Easy
An example of a learned behavior is
[ "driving a car", "having blue eyes", "shivering in the cold", "breathing air" ]
A
train
null
ai2_arc_ARC-Easy
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?
[ "I and O", "Ir and O", "Fe and O", "Pb and O" ]
C
train
null
ai2_arc_ARC-Easy
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?
[ "The mass is reduced.", "The volume is increased.", "The temperature is reduced.", "The pressure is increased." ]
C
train
null
ai2_arc_ARC-Easy
Which process directly adds carbon into the atmosphere?
[ "increasing plant populations", "decreasing animal populations", "burning fossil fuels", "forming sedimentary rock" ]
C
train
null
ai2_arc_ARC-Easy
Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?
[ "They swim the same way.", "They eat the same food.", "They live in the same area of the ocean.", "They have similar anatomies." ]
D
train
null
ai2_arc_ARC-Easy
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?
[ "swimming in arctic waters", "eating large amounts of fish", "being preyed upon by other animals", "living in an environment with high temperatures" ]
A
train
null
ai2_arc_ARC-Easy