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?

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