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About 87 percent of Earth's history is called the ____.
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
Why did many plants die at the end of the Mesozoic?
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
What is NOT evidence that links dinosaurs to modern birds?
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
During the Pennsylvanian period, large tropical swamps extended across North America, eventually forming ____.
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
Which period makes up nearly all of the Cenozoic Era?
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
The most common Precambrian fossils (which also produced LOTS of oxygen!) are layered mounds of calcium carbonate called ____.
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
Which of the following lists the divisions of the geologic time scale in order from longest to shortest?
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
Which title best describes the current geologic age?
they both lay eggs
Precambrian
age of mammals
Tertiary
Dust from a meteorite collision blocked sunlight.
vast coal deposits
stromatolites
era, period, epoch
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