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.
(on Archives.gov). Passed by Congress May 13, 1912, and ratified April 8, 1913, the 17th amendment modified Article I, section 3, of the Constitution by allowing voters to cast direct votes for U.S. Senators.Prior to its passage, Senators were chosen by state legislatures.on Archives.gov). Passed by Congress May 13, 1912, and ratified April 8, 1913, the 17th amendment modified Article I, section 3, of the Constitution by allowing voters to cast direct votes for U.S. Senators.