Chap. 17&18 Vocab.

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Clues

Scientists who study fossils
Kingdom of unicellular prokaryotes whose cell walls don't contain peptiglycan
The study of evolutinary relationships among organisms
Scientists classify organisms and assign each organism a universally accepted name
kingdom composed of eukaryotes that are not classified as plants,animals, or fungi
Species died out
Unit of time into which eras are subdivided
Domain of unicellular prokaryotes that have cell walls that don't contain peptidogkycan
A group of closely related species
Kingdom composed of heterotrophs
One of the several subdivisions of the time between the precambrian and the present
Large scale evolutionary changes that take place over long periods of time
Many types of living things became extinct at the same rate
Microscopic fossils
Diagram that shows the evolutionary relationships among a group of organisms
The length of time required for half of the radioactive atoms in a sample to decay
kingdom of multicellular eukaryotes heterotrophs whose cells don't have cell walls
Group of closely related classes
Most inclusive taxonomic category; larger than a kingdom
Level of organization inot which organisms are classified