BIO 111 Study Guide - Midterm Guide: Continental Drift, Plate Tectonics, Cambrian Explosion
Document Summary
Idiosyncratic extinction not every group suffers the same amount. Rediversification after a mass extinction event, the organisms that survived evolve and become more diverse. Iridium anomalies iridium is an element that comes from asteroids, when present it means that a meteorites hit earth there. Half-life can help date events in history: half-life the specific time interval at which half the atoms in a radioisotope become a different, stable isotope. Paleo-magnetic dating determines the age of rocks by looking at the patterns in. Earth"s (cid:373)ag(cid:374)etis(cid:373: different eons, hadean eon the time on earth before life evolved, archean eon early history of life, ended when photosynthetic organisms appeared, proterozoic eon prokaryotic life diversified rapidly, phanerozoic eon multicellular eukaryotes. Stratigraphy the use of sedimentary levels in order to date fossils within the strata. Radiometric dating the ability to use half-life to date fossils and rocks.
