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20
×
Which rock layer came first: R, X, B, or F?
X
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15
×
How old something actually is in years is known as...
Absolute age
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20
×
If the Earth's entire 4.5-billion-year history is represented by my arm span, human existence is the size of...
A fingernail shaving
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20
×
________ (cells that contain internal organs) developed into the first really big, complex, and sometimes kinda weird forms of life.
Eukaryotes
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banana
Go to last place!
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gift
Win 25 points!
Okay!
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gift
Win 20 points!
Okay!
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thief
Give points!
5
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25
20
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The animal this fossil belongs to is a...
Giant prehistoric sloth
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15
×
Which eon of Earth's history has no fossils?
Hadean Eon
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15
×
Most major groups of animals first appeared in the fossil record during the...
Cambrian Explosion
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20
×
Why was it necessary for plants to be present before animals could survive?
Oxygen, food
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15
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The age of one thing in comparison to another is called...
Relative age
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20
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The second-largest division of geologic time, which is subdivided into periods, is an...
Era
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15
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Dying out or extermination of a species is called...
Extinction
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banana
Go to last place!
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seesaw
Swap points!
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fairy
Take points!
5
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25
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banana
Go to last place!
Oops!
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baam
Lose 5 points!
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magnet
Take 25 points!
Okay!
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fairy
Take points!
5
10
15
20
25
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baam
Lose 25 points!
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20
×
Which is the youngest rock layer in the picture?
H
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20
×
Which fossil in the picture serves as an index fossil?
A
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×
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