Extinction  

Oleh:

Hasman, Melvia A.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: English Teaching Forum (http://exchanges.state.gov/englishteaching/forum/archives.html) vol. 38 no. 4 (Apr. 2000), page 1-2.
Topik: Extinction; Humans; Fossil
Fulltext: Extinction.pdf (274.61KB)

Isi artikel

Humans are one of about 1.75 million identified species. Many scientists believe that millions more species inhabit our world yet remain unidentified. Some species have become extinct after less than half a million years, while other species have existed almost unchanged for many millions of years. Contrary to popular belief, extinction is a natural process. Based on fossil record, the average rate of extinction has been one species out of every million per century. However, today experts predict that at least one of every four species may become extinct by 2050.

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