HS-LS4-5

Evaluate the evidence supporting claims that changes in environmental conditions may result in: (1) increases in the number of individuals of some species, (2) the emergence of new species over time, and (3) the extinction of other species.

  1. Animals

    Coming: The sixth mass extinction?

    Species are dying off at such a rapid rate — faster than at any other time in human existence — that many resources on which we depend may disappear.

    By Alison Pearce Stevens
  2. Animals

    Even penguins get the flu

    Scientists have just identified ‘live’ bird flu virus in Antarctic penguins. But the infections may not be novel. There are some signs these germs have been infecting local wildlife for up to 80 years.

    By Janet Raloff
  3. Oceans

    Sea changes

    Carbon dioxide is making the oceans more acidic.

    By Stephen Ornes