Env. Bio Chapter 17 HIstory of Life on Earth Vocab

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one of several subdivisions of the time between the Precambrian and the present

process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms

large-scale evolutionary changes that take place over long periods of time

process by which unrelated organisms independently evolve similarities when adapting to similar environments

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

method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock

scientist who studies fossils

pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change