Which type of wave cannot travel in a vacuum? electromagnetic wave

microwave

light wave

sound wave

What arguments might a conservation used to justify president roosevelt's expansion of power of federal government

Which of these reasons describes why spain was motivated to compete with portugal

Which of the following could affect the human population? a hurricane makes landfall on an uninhabited island. a deadly virus emerges that can pass from human to human. a civil war breaks out in italy. a solar eclipse occurs.