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.
Confidence votes 22.1K. The 17th Amendment to the U.S. Constitution, ratified on April 8, 1913, changed who elects U.S. Senators. From 1788 until 1912, each U.S. Senator was elected by the state legislature.Since 1914, each U.S. Senator is directly elected by the people of the state.Some states were appointing their U.S. Senators based on the popular vote for several years before the Amendment was ratified.he Constitution had set up a democratic government. This is when  the citizens have the right to vote. The US Constitution set up a  form of government known as a Constitut â¦ ional Republic. This is not  a full Democracy.