Evolutionary process whereby one species evolves into another without any splitting into multiple species Punctuated Equilibrium Model of the rate of evolution in which there are long periods of little change (stasis) in the species punctuated by short bursts of rapid change (usually due to an environmental change) Extinction. Rapid disappearance of a species.
17th Amendment to the U.S. Constitution: Direct Election of U.S. Senators. Americans did not directly vote for senators for the first 125 years of the Federal Government. The Constitution, as it was adopted in 1788, stated that senators would be elected by state legislatures.
required that U.S. Senators be elected directly by the people   DIRECT ELECTION OF SENATORS(1913) Passed by Congress May 13,1912.Ratified Alpril 8 ,1913. NOTE: Article 1 S â¦ ection 3, of the Constitution was modified by the Seventeenth Amendment...it was passed on May 13, 1912, ratified by the states within a year and formally declared an amendment to the Constitution on May 31, 1913 by Bryan, in his role as Secreta â¦ ry of State, becoming the Seventeenth Amendment. http://en.wikipedia.org/wiki/Seventeenth_Amendment_to_the_United_States_Constitution.