Concept explainers
Introduction:
“Endangered species” become extinct in all or part of its range and threatened species are vulnerable to become endangered in the near future. Not all rare species are threatened or endangered. In the United States, endangered and threatened species are listed by the United States Fish and Wildlife Service (USFWS).
Answer to Problem 1SA
Correct answer: An endangered species has population level so low it is at great risk of extinction in the near future. Therefore option b. is correct.
Explanation of Solution
Reasons for the correct statement:
Option b. is given as “endangered.”
ESA describes an "endangered species" as a species that is in the risk of extinction throughout all or a particular area of its geographic range. Therefore option b. is correct.
Reasons for incorrect statements:
Option a. is given as “endemic.”
Endemic species are organisms that are restricted to one geographic region. For example, lemurs are endemic and restricted to Madagascar. However endemic species are not at great risk of extinction. Therefore option a. is not correct.
Option c. is given as “threatened.”
The Endangered Species Act (ESA) describes a threatened species as a species that is vulnerable to become an “endangered species.” However threatened species are not at great risk of extinction. Therefore option c. is not correct.
Option d. is given as “Indicator.”
An indicator species is a species that represents the overall condition of an environment. For example, Tubifex tubifex is a worm that lives in the mire of streams and lakes. This worm represents overall condition environment such as water quality, low-oxygen levels or heavy metal contamination. However, indicator species are not at great risk of extinction. Therefore option d. is not correct.
Hence, option a., b., and d. are incorrect.
Endangered species has population levels so low it is at great risk of extinction in the near future.
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