Flashcards - NES General Science: History of Life

Flashcards - NES General Science: History of Life
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mass extinction
An extinction event is a widespread and rapid decrease in the biodiversity on Earth
evolution
Evolution is change in the heritable characteristics of biological populations over successive generations
extinct
In biology and ecology, extinction is the end of an organism or of a group of organisms , normally a species
paraphyletic
In taxonomy, a group is paraphyletic if it consists of the group's last common ancestor and all descendants of that ancestor excluding a few-typically only one or two-monophyletic subgroups
radioactive dating
Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed
gradualism
Gradualism, from Latin gradus , is a hypothesis, a theory or a tenet assuming that change comes about gradually or that variation is gradual in nature
International Union for Conservation of Nature
The International Union for Conservation of Nature and Natural Resources is an international organization working in the field of nature conservation and sustainable use of natural resources
clade
A clade is a group of organisms that consists of a common ancestor and all its lineal descendants, and represents a single "branch" on the "tree of life"
cladograms
A cladogram is a diagram used in cladistics which shows relations among organisms

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