BIO 103: Ch. 25 The Origin and Diversity of Life (Macroevolution) Vocab
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5 Terms
Macroevolution
Evolutionary change above the species level. Examples of macroevolutionary change include the origin of a new group of organisms through a series of speciation events and the impact of mass extinctions on the diversity of life and its subsequent recovery
Radiometric Dating
A method for determining the absolute age of an object (e.g. rocks, fossils) based on the half-life of radioactive isotopes... comparing the relative percentages of a radioactive (parent) isotope and its stable (daughter) isotope.
Plate Tectonics
The theory that the continents are part of great plates of Earth's crust that float on the hot, underlying portion of the mantle; movements in the mantle cause the continents to move slowly over time.
Mass Extinction
The elimination of a large number of species throughout Earth, the result of global environmental changes.
Adaptive Radiation
Period of evolutionary change in which groups of organisms form many new species whose adaptations allow them to fill different ecological roles in their communities.