PPT-Chapter 18 Mass Extinctions,

Opportunities and Adaptive Radiations Overview Extinctions Adaptive RadiationsNew Niches Stem mammals survived and experience adaptive radiation Evolution of birds feathers flight and flightlessness. And 57375en 57375ere Were None meets the standard for Range of Reading and Level of Text Complexity for grade 8 Its structure pacing and universal appeal make it an appropriate reading choice for reluctant readers 57375e book also o57373ers students At night they use their natural jet propulsion to maneuver up over 325 meters to feed. . Why an “explosion”?. What were conditions like at the end of the . Proterozoic. ?. . Supercontinent was breaking up. The struggle for life on earth. Mass Extinction - Definition. A significant proportion of species become extinct (between 30% and 95%) . The extinctions operate across a wide range of environments and . Overview. Extinctions are as important in the history of life as are the evolution of new species. Explaining extinctions is just as challenging a scientific question as explaining the evolution of new species. PUMP How the magnetic sector mass spectrograph works: qvB = mv), B the magnetic field, m is the mass of the Classically, the speed of the ion, v, is related The sixth . m. ass . e. xtinction. Objectives. Define . extinction.. Give examples of (1) past mass extinctions (2) and recent species . extinctions.. Compare current extinction rates with background extinction . 1) Geological Time Scale. 2) Major Episodes in History of Life. 3) Extinctions and Radiations. Today. ’. s OUTLINE:. Geology plays an Important role in Evolutionary Thinking. Patterns of extinctions and evolutionary change in the fossil record were among the main influences on. What is extinction? . Extinctions occur when the last individual of a species dies out. . Functional Extinctions occur when individuals remain but the odds of sustainable reproduction are low. i.e. the species is effectively extinct even though individuals remain. . Up to this point in the course we have treated everything as a single point in space, no matter the mass, size, or shape. We call this “special point” the . CENTER OF MASS. . The . CoM. is basically a coordinate which represents the average position of the mass.. 99.9% of all living things that have ever existed on earth have gone extinct. earth has experienced 5 five extinctions . Geologic time scale. Era. Largest unit of geologic time . lasts tens to hundreds of millions of years and consists of two or more periods. . Essential Questions. What is extinction?. Which species have become extinct in modern times? . What are the characteristics of past mass extinctions? . How do modern extinction rates compare with natural (background) rates?. Mass refers to how heavy something is.. Mass is measured with a scale.. English Units vs. Metric Units. English Units – units used in the U.S.. 1 Pound = 16 Ounces. One Loaf = 1 Pound. One slice = 1 Ounce. Unit . 2: Causes of Mass . Extinctions. Rebecca Teed (Wright State University). Objectives. By the end of this exercise, you should be able to:. Explain how the effects . of either flood-basalt eruptions or . Will M. Farr. Northwestern University, CIERA. (See . Kreidberg. , . Bailyn. , WMF, . Kalogera. , arXiv:1205.1805). The Mass Gap. Strange, because main-sequence mass distribution . rising. at low M. (.