Of the millions of plant and animal species on Earth, approximately how many have been identified?

[5-22-2022] Microsoft Rewards Bing Homepage Quiz Question: Of the millions of plant and animal species on Earth, approximately how many have been identified?

The given options are:

  • Less than 20%
  • About half
  • More than 65%

Correct Answer: Less than 20%

Info: Global biodiversity is the measure of biodiversity on planet Earth and is defined as the total variability of life forms. More than 99 percent of all species that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth’s current species range from 2 million to 1 trillion, of which about 1.74 million have been databased thus far. Incredibly, scientists believe that more than 80% of all species on land and in the ocean have yet to be identified, meaning there is so much more life out there to discover!


Today’s “Microsoft Rewards Bing Homepage Quiz” has three questions related to biodiversity. Each question has only one correct answer and carries one point. The wrong answer does not earn any points. So, select only the correct answers.

All three questions from today’s Bing Homepage Quiz are below. You can find their answers by visiting those pages.

  1. This cattle egret benefits from the Burchell’s zebra’s behavior, without harming the zebra. What’s that called?
  2. Which United Nations event is observed on May 22?
  3. Of the millions of plant and animal species on Earth, approximately how many have been identified?

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