Conserving Biodiversity
Chapter 16, Problem 7
The web of life refers to the . a. evolutionary relationships among living organisms; b. connections between species in an ecosystem; c. complicated nature of genetic variability; d. flow of information from parent to child; e. predatory effect of humans on the rest of the natural world
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Related Practice
Textbook Question
Current rates of species extinction appear to be approximately historical rates of extinction.
a. equal to;
b. 10 times lower than;
c. 10 times higher than;
d. 50 to 100 times higher than;
e. 1000 to 10,000 times higher than
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Textbook Question
According to the generalized species-area curve, when habitat is reduced to 50% of its original size, approximately of the species once present there will be lost.
a. 10%;
b. 25%;
c. 50%;
d. 90%;
e. it is impossible to estimate the percentage
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Textbook Question
Which cause of extinction results from humans' direct use of a species?
a. overexploitation;
b. habitat fragmentation;
c. pollution;
d. introduction of competitors or predators;
e. global warming
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Textbook Question
Which of the following is an example of a mutualistic relationship?
a. moles catching and eating earthworms from the moles' underground tunnels;
b. cattails and reed canary grass growing together in wetland soils;
c. cleaner fish removing and eating parasites from the teeth of sharks;
d. Colorado potato beetles consuming potato plant leaves;
e. more than one of the above
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Textbook Question
The risks faced by small populations include . a. erosion of genetic variability through genetic drift; b. decreased fitness of individuals as a result of inbreeding; c. increased risk of experiencing natural disasters; d. A and B are correct; e. A, B, and C are correct
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Textbook Question
One advantage of preserving more than one population of an endangered species at more than one location is .
a. a lower risk of extinction of the entire species if a catastrophe strikes one location;
b. higher levels of inbreeding in each population;
c. higher rates of genetic drift in each population;
d. lower numbers of heterozygotes in each population;
e. higher rates of habitat fragmentation in the different locations
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