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Science Around Cincy - Geologic Timeline

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Hadean Eon

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Terms in this set (12)

The earliest period in Earth's history (4.5 to 3.8 billion years ago), when the planet's formation was still ongoing and was unsuited to life.

prokaryotic cell

a type of cell that does not have a nucleus or other membrane-bound organelles (also known as bacteria)

building blocks of proteins

A building block of DNA and RNA

A simple sugar that is an important source of energy.

Eukaryotic cells

a type of cell that contains a nucleus and other organelles that are bound by membranes

endosymbiotic theory

theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms

an organism made of a single cell

An organism made up of more than one cell.

Cambrian explosion

A burst of evolutionary diversification when most of the major phyla of animals appeared in a relatively brief time in geologic history; recorded in the fossil record about 545 to 525 million years ago.

mass extinction

event in which many types of living things become extinct at the same time

An inherited trait that helps an organism survive and reproduce