Unit 1: The History of Life on Earth-Vocabulary

Remains or traces of a once living organism

The method of finding the absolute age of a rock based on comparing the amounts of unstable, radioactive particles to stable particles in a sample.

The collection of all known fossils and their placement in order from earliest to most recent; the history of life on earth as it is preserved by fossils.

When all members of a species die out and there are no members of the species left on earth

The process of biological change by which populations become different from their ancestors over many generations.

An ancient species from which two or more species evolved.

An organism's body structure and structural traits.

The study of the development of an unborn or unhatched organism.

(a)   form when specific conditions occur that preserve an organisms remains.

Using radiometric dating can tell you a rocks absolute (a)   .