Boundaries between eras of geological time
A) were based on abrupt changes in fossil records.
B) are divided into periods from oldest, the Mesozoic era, to the youngest, the Palaezoic era.
C) are dependent on the movement of tectonic plates.
D) are associated with magnetic reversal.
E) are identified by the animal species which appear.

Question

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Boundaries between eras of geological time were based on abrupt changes in fossil records, marking significant shifts in the types of organisms present on Earth.

Boundaries Between Eras of Geological Time