Threats to Biodiversity

How many species have actually gone extinct?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. Scientists have estimated that over the course of Earth's history, anywhere between 1 and 4 billion species have existed on this planet. Be it through disease, genetic obsolescence, over-predation or any number of other factors, the overwhelming majority of these species are now extinct. Of these billions of species, roughly 50 million still survive into the modern era. While these numbers are certainly extreme at first glance, it serves as proof that extinction, while a sad occurrence, is a part of life for all living things.

    More answers from Discovery Channel »

Still Curious?
  • What is heartwood and sapwood?

    Answered by Discovery Channel

  • How many great white sharks are left in the world?

    Answered by John O'Sullivan

  • Why artificial photosynthesis alternative other technologies?

    Answered by Planet Green


What are you curious about?

Image Gallery