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.
Amendment to the United States Constitution is one that determines the manner. or system in which United States Senators are to be appointed. It also provided. for a term length for Senators, as well as procedures to be considered in the. event that a State has a vacancy in the Senate. The 17th Amendment was proposed. in May 13th, 1912, with Connecticut being the last State needed to complete the. ratification process for Constitutional Amendments on April 8th, 1913. From. that date forward, all United States Senators would be appointed through a. direct election by popular vote.