200 students — 200-30% = 140 which means 30% of 200 is 60
Pericles instituted the world's first democracy in Athens.
A model that depicts population change through time is called "Demographic Transition." It is based on an analysis of observable shifts in birth and mortality rates in industrialized civilizations during the previous 200 years, which American demographer Warren Thompson started in 1929.
The demographic transition model developed by Warren Thompson explains how a nation's population varies over time. The assertion made is accurate. The demographic transition of Warren Thompson demonstrates how, over time, a country's population changes.
Learn more about demographic transition here: brainly.com/question/1139915
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Answer: A. Pressure from sediment turned decaying plankton at the bottom of the ocean into natural gas.
The answer is 300.
Sorry this answer is so late, I was just learning about it! Hope it helps. :)