The Biodiversity Crisis

Review Questions

With an extinction rate of 100 E/MSY and an estimated 10 million species, how many extinctions are expected to occur in a century?

  1. 100
  2. 10,000
  3. 100,000
  4. 1,000,000

Hint:

C

An adaptive radiation is________.

  1. a burst of speciation
  2. a healthy level of UV radiation
  3. a hypothesized cause of a mass extinction
  4. evidence of an asteroid impact

Hint:

A

The number of currently described species on the planet is about ________.

  1. 17,000
  2. 150,000
  3. 1.5 million
  4. 10 million

Hint:

C

A mass extinction is defined as ________.

  1. a loss of 95 percent of species
  2. an asteroid impact
  3. a boundary between geological periods
  4. a loss of 50 percent of species

Hint:

D