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Biology Chapter 19 vocabulary
History of Life
Terms in this set (19)
Refers to when a species has died out and has no living members.
A scientist who studies fossils.
The method of determining the age of a fossil by comparing its placement with that of fossils in other rock layers.
the method for determining the age of a sample from the amount of a radioactive isotope to the non-radioactive isotope of the same element in a sample.
A distinctive fossil that is used to compare the relative ages of fossils.
The length of time required for half of the radioactive atoms in a sample to decay.
Geologic Time Scale
A timeline used to represent Earth's history.
A major division of geologic time; usually divided into two or more periods.
A division of geologic time into which eras are subdivided.
The geologic processes, such as continental drift, volcanoes, and earthquakes, resulting from plate movement.
The pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change.
Process by which a single species or a small group of species evolves into several different forms that live in different ways.
Extinction caused by slow and steady process of natural selection.
The process by which two species evolve in response to changes in each other over time.
The process by which unrelated organisms independently evolve similarities when adapting to similar environments.
the evolution of a species by gradual accumulation of small genetic changes over long periods of time.
The changes in anatomy, phylogeny, ecology and behavior that take place in clades larger than a single species.
An event during which many species become extinct during a relatively short period of time.
The theory that proposes that eukaryotic cells formed from a symbiotic relationship among several different prokaryotic cells.
"I drink to those who lie buried around us," he said. And I replied, "I drink to your long life." (p.15)
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