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.
The Twelfth Amendment (Amendment XII) to the United States Constitution provides the procedure for electing the President and Vice President.It replaced Article II, Section 1, Clause 3, which provided the original procedure by which the Electoral College functioned.here is a point of contention regarding the interpretation of the Twelfth Amendment as it relates to the Twenty-second Amendment, ratified in 1951, which prohibits a person from being elected President more than twice.