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Questions and Answers List

Question	Answer
A record of the life forms and geologic events in Earth’s history.	Geologic time scale
A major division of geological time, subdivided into eras.	Eon
A major division of geological time that is a subdivision of an eon and is itself subdivided into periods.	Era
A division of geological time that is a subdivision of an era.	Period
An animal without a backbone.	Invertebrate
An animal with a backbone.	Vertebrate
A supercontinent that included most land on Earth and existed during the late Paleozoic and early Mesozoic.	Pangea