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Assessment Questions 7.19
1. Since 1500 C.E., how many terrestrial vertebrate species are estimated to have become extinct according to the passage?
Answer:
322 terrestrial vertebrate species.
2. What decline in the size of wild animal populations has been observed worldwide over the past 40 years, on average?
Answer:
An average decline of about 25% in the size of wild animal populations.
3. According to the International Union for the Conservation of Nature, what percentage of amphibian species is currently characterized as "threatened"?
Answer:
Over 40% of amphibian species.