Which is the BEST example of a pure substance?

Which statement BEST explains how periods on the periodic table are organized?

An ice cube is put into a heated pan. What will MOST LIKELY happen to the molecules in the ice as the ice is heated?

Which BEST explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

Which would LEAST LIKELY have an impact on global climate changes?

Which is an example of a renewable energy resource?

Which will MOST LIKELY result if there is increased upwelling in a coastal area?

Which BEST determines the health of a lake used as a source of freshwater?

A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?

Which BEST describes how ice cores are important to the study of geologic history?

Why do doctors suggest that people get a flu vaccine each year?

Which of these organisms is a producer in a marine ecosystem?

Which of these careers would a student studying biotechnology MOST LIKELY pursue?

Which BEST determines the number of wolves that can live in an area?

What happens to a population and to competition when there is a reduction of living space?

Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight. What type of relationship exists between the trees and the kudzu growing on them?

What do transitional fossils BEST support?

Tigers and household cats are members of the same family; however, their sizes are vastly different. What is the cause of this difference?

Why is a healthy diet important?

What happens to water molecules during the boiling process?

Which pair of elements has the most similar properties?

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

Which is a possible disadvantage of using flowing water to produce electricity?

Why is water from an aquifer more likely to be cleaner than water from other sources?

In which oceanic zone do clams and crabs survive by burrowing in the sand?

If a body of water has high turbidity levels, what can MOST LIKELY be concluded?

Scientists find dinosaur fossils in the bottom rock layers of a cliff and mammal fossils in the middle rock layer of the cliff. Which could BEST be concluded from this evidence?

Ten people became sick with the flu after attending a school dance. What is the scenario that could BEST explain how the people got sick?

Which is the BEST way to help prevent the flu from becoming a pandemic?

Which BEST explains the importance of nitrogen in the cycling of energy and matter?

Which is a way the agricultural biotechnology industry could have a positive impact on the environment?

If wolves prey on deer for food, what will MOST LIKELY happen to the deer population if wolves are removed from an area where deer live?

Where do plants get most of the energy they need to live and grow?

Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?

In the winter, the fur of the arctic fox is white. In summer, the fur darkens to a reddish brown. What MOST LIKELY causes the fur of the fox to change color?

Which would BEST allow a species to survive environmental changes?

How would smoking tobacco MOST LIKELY have a negative impact on the ability of an individual to succeed at physical activities?

Which shows one example of a physical change and one example of a chemical change?

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Which is a problem with using wind turbines to produce energy?

Which BEST describes the characteristics of a river basin?

Which factors can have the GREATEST effect on the health of a river system?

In the United States, which is responsible for ensuring the safety of the country's drinking water?

Which statement BEST describes the Law of Superposition?

What do earthquakes tell scientists about the history of the planet?

How do scientists know that some mountains were once at the bottom of an ocean?

Malaria is a common disease in many countries. What is the cause of this disease?

How can the rate of an infectious disease be drastically reduced?

What is involved in creating genetically modified bacteria?

In a food pyramid, which BEST explains why the number of organisms decreases from one trophic level to the next?

What process is MOST responsible for the extinction of most species of plants and animals that have lived on Earth?

Which would indicate that a series of fossils represent the evolution of the horse?

A strawberry farmer finds that, after a hard freeze, some of his strawberries are still alive. Which BEST explains why these strawberries were able to survive?

Which food provides the MOST energy for the body in the shortest amount of time?

Why is protein an important part of a healthy diet?