1.
In percentage terms, the number of plants and animals threatened with extinction is relatively small when compared with mass extinction events in the past. The rate at which plants and animals are becoming threatened is large, however. How do these observations justify the projection that a mass extinction event is under way?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
2.
The chapter claims that the rate of extinctions on islands due to hunting and introduction of exotic species has probably peaked, and that newly endangered species are more likely to be found on continents and be threatened by habitat destruction. Why is this trend occurring?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
3.
Biologists claim that the all-taxa survey, now under way at the Great Smoky Mountains National Park in the United States, will improve their ability to estimate the total number of species living today. Why?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
4.
How are species-area curves used to relate rates of habitat destruction to projected extinction rates?
To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
