Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 47, Problem 8RQ
A mass extinction is defined as.
- a loss of 95 percent of species
- an asteroid impact
- a boundary between geological periods
- a loss of 50 percent of species
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Which of the following is believed to be common among all mass extinction events?
the type of event that causes the extinction
the number of species that went extinct
a significant change in the global climate
the type of species that went extinct
Find the flaws within the sentance/s
Extinction is the complete disappearance of a species from Earth. A mass extinction is when more than half of all extant species disappear from the fossil record and there have been at least five of them.
In order to prevent the extinction current species, some areas of earth are preserved while others are conserved. Conservation seeks to prohibit human activity in an area. Preservation seeks the sustainable use and management of natural resources.
An endemic species is only found in one location. A biodiversity hotspot has over 1500 species of endemic insects and 70% of the area has been disturbed. There are 34 biodiversity hotspots on Earth.
Many sustainable practices are used in agriculture. Crop rotation is the practice of growing different kinds of crops in the same area in sequenced seasons. Conservation tillage is any method of soil cultivation that completely tills under the soil to prepare for the next crop. Genetically modified crops are…
Paleomagnetic reversals cause mass extinctions when they occur.
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Chapter 47 Solutions
Biology 2e
Ch. 47 - Figure 47.6 Scientists measured the relative...Ch. 47 - Figure 47.9 The Svalbard Global Seed Vault is...Ch. 47 - Converting a prairie to a farm field is an example...Ch. 47 - Figure 47.16 Which of the following statements is...Ch. 47 - With an extinction rate of 100 E/MSY and an...Ch. 47 - An adaptive radiation is.__________ a burst of...Ch. 47 - The number of currently described species on the...Ch. 47 - A mass extinction is defined as. a loss of 95...Ch. 47 - A secondary plant compound might be used for which...Ch. 47 - Pollination is an example of_____________ a...
Ch. 47 - What is an ecosystem service that performs the...Ch. 47 - Which two extinction risks may be a direct result...Ch. 47 - Exotic species are especially threatening to what...Ch. 47 - Certain parrot species cannot be brought to the...Ch. 47 - What was the name of the first international...Ch. 47 - About what percentage of land on the planet is set...Ch. 47 - Describe the evidence for the cause of the...Ch. 47 - Describe the two methods used to calculate...Ch. 47 - Explain how biodiversity loss can impact crop...Ch. 47 - Describe two types of compounds from living things...Ch. 47 - Describe the mechanisms by which human population...Ch. 47 - Explain what extinction threats a frog living on a...Ch. 47 - Describe two considerations in conservation...Ch. 47 - Describe what happens to an ecosystem when...
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- The number of currently described species on the planet is about ________. a. 17,000 b. 150,000 c. 1.5 million d. 10 millionarrow_forwardWhich of the following mass extinctions caused the loss of over 80% of species and was due to increased volcanic activity in what is now Siberia, Russia? The Permian-Triassic Mass Extinction The Cretaceous-Paleogene Mass Extinction The Triassic-Jurassic Mass Extinction The Ordovician-Silurian Mass Extinctionarrow_forwardThe graph below shows the population of three different families of marine organisms along five different mass extinction events. Each colour on the graph represents a family of organisms, and the Y axis shows how many species belong to that family. a. What stage of population growth is displayed at point ‘0’ on the graph above? b. The Extinction Event that occurred at point 3 was particularly significant. Using the graph, explain how this event impacted each marine family. c. The extinction events mapped above had significant impact on marine life. What type of event could have a similar impact on the human population?arrow_forward
- The theory of island biogeography suggests that island colonization is affected by which of the following factors? Allopatric speciation Ecological tolerance Adaptative evolution Migration rates A) II only B) IV only C) I and II D) II and IIIarrow_forwardThere have been five main mass extinctions. Match each mass extinction event to its description. 1. Permian extinction 2. Cretaceous-Tertiary extinction 3. Triassic extinction 4. Devonian extinction 5. Ordovician extinction a. This extinction was most likely due to a change in sea level. During this event, about 60% of all marine species were eliminated. b. This is the best-known mass extinction. It eliminated most large animals, including the dinosaurs. c. This was the most severe extinction event. About 96% of life on Earth died during this event. d. This extinction was most likely caused by climate change. About 80% of land animals died during this event. e. This extinction was most likely due to a change in sea level. It especially affected coral reefs.arrow_forwardA large tropical island is found near the mainland. Based on the predictions of the MacArthur and Wilson equilibrium model of island biogeography this island will have… a. low immigration rates and low extinction rates b. high immigration rates and high extinction rates c. low immigration rates and high extinction rates d. high immigration rates and low extinction ratesarrow_forward
- The fossil record shows that in just the last 600 million years, there have been five instances of sharp decreases in the diversity and abundance of living organisms. what are these events? a. droughts b. mass extinctions c. reversals of the earth's magnetic field d. great migrationarrow_forwardCreate a Venn Diagram comparing and contrasting rapid and gradual mass extinction (make sure to include examples of each)arrow_forwardThe ends of many eras and periods in the geologic time scale are characterized by mass extinction. These events are triggered by different causes, but all are observed by the disappearance of (1) species in the succeeding rock strata. Write the answer for #1arrow_forward
- The movement of landmasses that have changed their positions, shapes, and association with other landmasses is called glaciation. Pangaea. continental drift. biogeography. geological scale.arrow_forwardWhich one of the following statements is not true? Speciation is the process of creating new species There have been five mass extinctions preserved in the fossil record All living things can be classified into one of four taxonomic domains Some bacteria are autotrophs Current rates of extinction are higher than background extinction ratesarrow_forward. Which of the following represents the permanent loss of a species?a. natural selection c. extinctionb. greenhouse effect d. climate changearrow_forward
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