Scientists use models to them study systems in nature, such as predicting the paths of hurricanes, demonstrating how cell organelles work, or determining the effect building a dam would have on the local ecosystem. explain why models are used in science.

List three reasons why people might be fascinated by something as dangerous as a nuclear weapon.

How can changes in technology or consumer demand make it difficult for people to get jobs? by changing the number or kind of jobs available by making it possible for some people to work fewer hours by making it difficult for people to buy what they want by creating a demand for things that are not available

Which of the following discoveries would be most likely to cause a scientific paradigm shift? a. the discovery of more rings around uranus b. the discovery of a new pathogenic virus transmitted by mosquitoes c. the discovery that a dormant volcano is showing signs of activity d. the discovery of a new species of salamander in the amazon rainforest e. the discovery that excess heat is radiating from the center of the earth and causing global climate change