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?

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