Explain Relationships Between Individuals, Events, Concepts Practice Test

Read the passage, then answer the question.

In a food chain, energy moves from one living thing to another. First, plants use sunlight to make their own food. Next, rabbits eat the plants and gain energy. Then, foxes eat rabbits and gain energy too.

However, energy does not move perfectly from level to level. When a rabbit runs or stays warm, it uses some energy. As a result, less energy is available for the fox. Therefore, each level depends on the one before it for energy, but the amount of energy gets smaller.

What does the passage show about the relationship between rabbits and foxes in this food chain?

Read the passage, then answer the question.

In 1903, Orville and Wilbur Wright tested a flying machine at Kitty Hawk, North Carolina. First, they studied how wings create lift by testing gliders. Next, they added an engine and propellers to create powered flight. Because their early tests showed problems with control, they changed the wing and tail design.

On December 17, 1903, the Wright brothers successfully flew the Wright Flyer for a short time. Later, they improved their designs so planes could fly longer and turn more safely. As a result, their careful sequence of testing and fixing problems led to better airplanes.

Which statement best describes how the Wright brothers’ early glider tests affected their later powered flight?