BIOLOGY:HOW LIFE WORKS (LL)-PACKAGE
3rd Edition
ISBN: 9781319369163
Author: Morris
Publisher: Macmillan Higher Education
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Chapter 33.4, Problem 8SAQ
Summary Introduction
An extinction event is a prevalent and rapid decrease in the biodiversity on the earth. The extinction event is recognized by a sharp alteration in the diversity and abundance of multicellular organisms. The extinction event occurs if the extinction rate increases with respect to the
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- what is mass extinction?arrow_forwardWhat are the five mass extinctions of the past and the current theory of the sixth mass extinction? For each extinctions, what caused the extinction and how was ecosystem stability impacted? Was there any speciation that occurred afterward?arrow_forwardWhat is the “sixth mass extinction event”?arrow_forward
- How have humans influenced extinctions?arrow_forwardIncreases in species diversity arise because of A)increases in the rate of speciation. B)decreases in the rate of extinction. C)higher rates of speciation than extinction. D)All of the above The rates of extinction since the origin of life have followed which pattern? A)Gradual decrease B)Gradual increase C)No change D)Several episodes of mass extinctions, with much lower rates of fluctuating extinctions in between Which of the following statements about the outcome of the evolution of a new species through hybridization is false? A)The new species is always an intermediate of the two parent species. B)The new species may have traits that allow it to inhabit environments different from both parental species. C)The new species may have greater genetic diversity and therefore greater trait diversity than the parental species. D)All of the above How can ecological processes influence the evolution of a population? A)Ecological…arrow_forwardAccording to Figure 2 above, how many extinction events contributed to the end-Ordovician mass extinction and when did they occur?arrow_forward
- Which of the following is likely a reason why evolutionary radiation would occur on islands? A) there are many more species on islands B) islands tend to have more favourable habitats than continents because they are moderated by the ocean C) islands may have fewer animal and plant groups and thus provide more ecological opportunities D) organisms can disperse easily across oceans E) islands often have more diverse habitats than continentsarrow_forwardWhat the difference between background extinction and biological extinction?arrow_forwardWhat patterns can be compare to the mass Extinctions events?arrow_forward
- Which eon has more events occurring in it? During which eon did life evolve? What is the difference between background extinctions and mass extinctions?arrow_forwardThroughout Earth’s history, many species, and perhaps even most of the species that ever existed, have become extinct. The causes are numerous: climate change, volcanic activity, the actions of oxygen-producing organisms, changes in carbon dioxide concentration, and even asteroid impacts. Have humans ever caused extinctions?arrow_forwardGeologic changes often accompany mass extinction of life forms. Why do you think this is true?arrow_forward
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