What is the correct sequence from oldest to most recent or current eras on the geologic time scale?

In a repredentive democracy: a.) people come together in large meetings to vote on public policy b.) the people govern themselves c.) political power is held by a small group of people d.) people elect officials to run the government for them

In the diagram below dab and dac are adjacent angles

Alow pressure system is formed when an air mass cools over a cool surface and sinks. true or false