Crossword puzzle clue "era with a big extinction"

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Here are the possible solutions for era with a big extinction clue

Answer
Clue
Relevancy
mesozoic
Clue
Era with a big extinction
Definition
of the Secondary geological period, including the Triassic, Jurassic, and Cretaceous systems
aeon
Clue
Era after era after era
Era after era
Definition
the largest division of geological time, composed of several eras, also EON
eon
Clue
Era after era
Era upon era
Definition
a long period of time, also AEON
adapt
Clue
Way to fight extinction
Fight extinction, maybe
Avoid extinction, say
Definition
to make suitable

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