Which is the best example of a pure substance?

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

Which best describes a chemical change?

Which explains why the total mass of the products would be less than the total mass of the reactants after a chemical reaction?

Which would least likely have an impact of global climate change?

Which is an example of a renewable energy source?

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 vaccines each year?

Which macromolecule gives us the daily energy we need?

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?

Which is the best example of a mixture?

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?

What is a disadvantage of wind and geothermal energy

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