Approximately 200 of the 300 native species of fish in Lake Victoria haven't been observed since the 1960s and are therefore probably extinct. Using the estimate of the background extinction rate, how many species of Lake Victoria fish would one expect to have naturally become extinct during the last 50 years?

Question

Quizplus · Accepted Answer

The background extinction rate is typically estimated at about 1 to 5 species per year per million species. Given that there are only 300 species in Lake Victoria, the expected natural extinction rate over 50 years would be much less than 1 species, making A the correct choice.

Approximately 200 of the 300 Native Species of Fish in Lake