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What is the name of a sea scorpion that lived in the Silurian period?
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
An exposed area of the oldest continental rock, or craton, is called
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
A crablike invertebrate that is the most common fossil of the Cambrian is called
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
Eras are divided into
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
The longest segment of geologic time is
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
A modern human or a recent human like ancestor is called
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
Ancient tiny animals that lived in oceans & are good index fossils are
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
Main divisions of an eon are divided into
graptolites
a shield
an eon
eurypterid
eras
a hominid
a trilobite
periods
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