Chapter 47: Q. 24 (page 1401)
Describe what happens to an ecosystem when a keystone species is removed.
Removing a keystone species from an ecological community may cause a collapse in diversity.
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The Svalbard Global Seed Vault is located on
Spitsbergen island in Norway, which has an arctic
climate. Why might an arctic climate be good for seed
storage?
Describe two types of compounds from living things
that are used as medications.
Scientists measured the relative abundance of fern spores above and below the K-Pg boundary in this rock sample. Which of the following statements most likely represents their findings?
a. An abundance of fern spores from several species was found below the K-Pg boundary, but none was found above.
b. An abundance of fern spores from several species was found above the K-Pg boundary, but none was found below.
c. An abundance of fern spores was found both above and below the K-Pg boundary, but only one species was found below the boundary , and many species were found above the boundary.
d. Many species of fern spores were found both above and below the boundary, but the total number of spores was greater below the boundary.
Describe two considerations in conservation preserve design
A mass extinction is defined as ________.
a. a loss of 95 percent of species
b. an asteroid impact
c. a boundary between geological periods
d. a loss of 50 percent of species
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