Why does sound increase in pitch as a sound source approaches, as demonstrated by the Doppler effect?

possible the invasion of room could have been avodiable but the people of rome were to stubboron and to wealthy the kingdoms saw them as a threat if they dialred it downa   bit ten i dont think they wouldnt failed   china was not iacvvdoaible they caused war to much and were out of hand therefor that must have happened india i dont really know it could of

unlimited governmental powers

explanation:

unlimited governmental powers was not a feature of the new state governments. state governments in the u.s. are structured in the same way as the federal government, with executive, legislative, and judicial branches.