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Chapter 47: Q 7. (page 1400)
The number of currently described species on the planet
is about ________.
a. 17,000
b. 150,000
c. 1.5 million
d. 10 million
The correct option is (c).
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Describe two types of compounds from living things
that are used as medications.
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
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?
An adaptive radiation is________.
a. a burst of speciation
b. a healthy level of UV radiation
c. a hypothesized cause of a mass extinction
d. evidence of an asteroid impact
What is an ecosystem service that performs the same function as a pesticide?
a. pollination
b. secondary plant compounds
c. crop diversity
d. predators of pests
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