Human Biology: Concepts and Current Issues - With Access (Custom)
15th Edition
ISBN: 9781323045237
Author: Johnson
Publisher: PEARSON
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Chapter 22, Problem 7AWK
Summary Introduction
To review
The causes of extinction and if humans are one of them.
Introduction:
Extinction means that a life-form dies out completely. Throughout the evolutionary history of the earth, major catastrophic events have sometimes wiped out whole groups of species regardless of fitness. Climate changes, volcanic activity, the actions of oxygen-producing organisms, changes in carbon dioxide concentration, asteroid impacts, have all lead to the extinction 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
What is the relationship between extinction, its impact on biodiversity, and ecosystems?
When a species becomes extinct, the vacancy of that species allows another species to invade and transform the ecosystem so there is no longer biodiversity, which allows the ecosystem to flourish.
The extinction of plants and animals leaves a vacancy in the biodiversity of the ecosystem, which can cause the ecosystem to collapse.
The extinct plants and animals can come back as a different species, creating more biodiversity within the ecosystem.
The extinction of plants and animals does not have an impact on the biodiversity of an ecosystem.
What are some of the hypothesized causes of Earth’s biggest mass extinctions?
Chapter 22 Solutions
Human Biology: Concepts and Current Issues - With Access (Custom)
Ch. 22 - Do you think the skeletons of Liang Bua Cave...Ch. 22 - Is it important that we try to discover the...Ch. 22 - Describe the three key elements of evolution.Ch. 22 - Explain how a fossil is created.Ch. 22 - List some of the main sources of evidence for...Ch. 22 - Prob. 4CRCh. 22 - Prob. 5CRCh. 22 - Prob. 6CRCh. 22 - Explain how rising atmospheric concentrations of...Ch. 22 - List the features that make Hominidae different...
Ch. 22 -
9. Describe the origins of Homo sapiens.
Ch. 22 - Explain why racial differences may disappear...Ch. 22 - Prob. 1TYCh. 22 - Prob. 2TYCh. 22 - Prob. 3TYCh. 22 - Vestigial structures, homologous structures, and...Ch. 22 -
5. Which of the following statements about...Ch. 22 - Which of the following best describes evolutionary...Ch. 22 - Prob. 7TYCh. 22 - Genetic drift is most likely to affect: a. every...Ch. 22 -
9. Which of the following would be described as...Ch. 22 - Which of the following statements is true? a. Mass...Ch. 22 - In what order did events occur that led to life on...Ch. 22 - Prob. 12TYCh. 22 -
13. Which of the following statements about the...Ch. 22 - Prob. 14TYCh. 22 - Which of the following is not believed to be a...Ch. 22 - Prob. 1AWKCh. 22 - Prob. 2AWKCh. 22 - Critics of evolution often charge, correctly as it...Ch. 22 - Prob. 4AWKCh. 22 - Prob. 5AWKCh. 22 - It is believed that humans evolved in Africa and...Ch. 22 - Prob. 7AWKCh. 22 - Of all the great evolutionary advances of life on...
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- Scientists are examining the possible role of a large asteroid in the Cretaceous mass extinction event. A large asteroid strike would likely have caused rapid climate cooling and diffusion of sunlight. Which of the following statements are the best null and alternative hypotheses when scientists look at the geologic evidence of extinction related to the asteroid strike? Null: The rate of extinction would be steady over the entire length of time the climate was altered. Alternative: The rate of extinction would be greatest immediately before the asteroid strike. Null: The rate of extinction would gradually decrease over the entire length of time the climate was altered. Alternative: The rate of extinction would be at its lowest immediately after the asteroid strike. Null: The rate of extinction would be steady over the entire length of time the climate was altered. Alternative: The rate of extinction would be greatest immediately after the asteroid strike. Null: The rate of extinction…arrow_forwardIf extinction is a natural part of life on Earth, why should we care about protectingendangered species Explainarrow_forwardBecause mass extinction is a natural process that may facilitate evolution during the period of thousands to millions of years that follow it, should humans be concerned about the current mass extinction we are causing? Why or why not?arrow_forward
- Some scientists believe we are in the midst of a new phase of mass extinction, influenced by human behavior, threatening the earth’s biological diversity and contributing to widespread ecological crises. How can the study of non-human species help shape human responses to these potential threats?arrow_forwardMost biologists and climatologists agree that the earth is warming, why do people disregard the evidence for global warming? What should be done to reach the public?arrow_forwardWhat seems to be a common occurrence with all mass extinction events? Rising CO2 Rising water pH Rising temperatures None of the abovearrow_forward
- Allan Pounds and Kevin Anchukaitis both think only one factor - either climate change or an El Nino event - killed the golden toad. However, might they both be right? Could it be that the dry conditions created by the El Nino event were worsened by underlying climate change effects, so that El Nino and climate change together caused the extinction of the golden toad in Monteverde? Yes, the El Nino event in combination with climate change could have led to the extinction of the golden toad. Multiple factors can influence species' extinction. O No, only one factor - either climate change or El Nino - acting alone killed the golden toad. Species are only ever affected by one environmental factor, never by multiple factors.arrow_forwardWhich of the following statements about extinction is not correct? (a) extinction is the permanent loss of a species (b) extinction is a natural biological process (c) once a species is extinct, it never reappears (d) human activities have little impact on extinctions (e) thousands of plant and animal species are currently threatened with extinctionarrow_forwardWhich of the following scenarios best explains how resource partitioning can lead to adaptive radiation? The lack of competition between individuals leads to better survival and reproduction rates. The utilization of different resources requires different adaptations, selecting for different traits. The lack of competition leads to a more balanced ecosystem, resulting in more offspring. There is no connection between adaptive radiation and the resource partitioning in nature.arrow_forward
- Identify a species that your group thinks is ok to drive to extinction and justify the reasons for this decision. Can you anticipate any consequences of losing this species from the Earth?arrow_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_forwardAnswer these questions A) State other factors that cause extinction B) Why organisms found on islands are more vulnerable to extinction than other organisms? C) How extinction can be prevented?arrow_forward
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