Which period makes up nearly all of the Cenozoic Era?

During the Pennsylvanian period, large tropical swamps extended across North America, eventually forming ____.

The most common Precambrian fossils (which also produced LOTS of oxygen!) are layered mounds of calcium carbonate called ____.

Which era is after the Precambrian?

What is NOT evidence that links dinosaurs to modern birds?

Why did many plants die at the end of the Mesozoic?

The first truly large organisms on Earth were ____.

Which title best describes the current geologic age?

Which of the following lists the divisions of the geologic time scale in order from longest to shortest?

About 87 percent of Earth's history is called the ____.

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