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.
- Fossils
Scientists Say: Coprolite
Every living thing and signs of its existence — right down to their wastes — can fossilize under the right conditions. When poop fossilizes, it gets a special name.
- Earth
Dino double whammy
Most scientists think an asteroid helped kill off the dinosaurs. But new calculations suggest that asteroid might have gotten some help from a long series of volcanic eruptions in what is now India.
- Animals
Tar pit clues provide ice age news
New analyses of insects and mammals trapped in the La Brea Tar Pits point to climate surprises during the last ice age.
- Earth
How people have been shaping the Earth
We are the dominant force of change on Earth. Some experts propose naming our current time period the ‘Anthropocene’ to reflect our impact.
- 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.
- 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.
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