Earth Sci Ch 30 Vocab

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A modern human or a recent human like ancestor is called

The longest segment of geologic time is

Mats of cyanobacteria that formed domes in Precambrian time are called

Ancient plant-looking creatures related to seastars are called

Ancient tiny animals that lived in oceans & are good index fossils are

Eras are divided into

What is the name of a sea scorpion that lived in the Silurian period?

Main divisions of an eon are divided into