Complete the passage to distinguish between mechanical and electromagnetic waves. Waves that move through matter only are called
mechanical
waves. Waves that move through space are called
radiation
⇒ electromagnetic waves.

The tea party movement is a. an official third party that challenges both democrats and republicans in national elections. b. an organized challenge to incumbents in the republican party by the most conservative wing of the republican party. c. an organized challenge to incumbents in the democratic party by the most liberal wing of the democratic party. d. an offspring of the green party that runs for state and local office in many midwestern states. e. the now defunct party that gave way to the republican party at the end of the “second party system.”

Which two statements regarding graduated driver licensing are true? select all the correct answers. gdl new drivers gain skills under low-risk conditions. gdl new drivers gain skills under high-risk conditions. gdl laws are the same across states. gdl laws vary across states. gdl does not need parental supervision and coaching.

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true. b) some other scientific experts read the papers and provide quality control by eliminating many mistakes. c) an editor reads the papers, to make sure that all the semicolons are in the correct places. d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog. e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.