HS-LS2-6
Evaluate the claims, evidence, and reasoning that the complex interactions in ecosystems maintain relatively consistent numbers and types of organisms in stable conditions, but changing conditions may result in a new ecosystem.
- Animals
Rare as a rhino
Most species are rare. Some have always been rare. A problem develops when people are responsible for accelerating a species’ rarity to the point that extinction threatens.
- Animals
A library of tweets (and howls and grunts)
The Macaulay Library houses a world of animal sounds. And now anyone with an Internet connection can check out this audio collection.
- Environment
Native ‘snot’
The ‘rock snot’ choking rivers may be native algae. Experts blame its sudden and dramatic emergence on changes in Earth’s atmosphere, soils and climate.
- Life
Caught in the act
Scientists observe some evolutionary speed demons as they adapt over the course of just a few years to new environmental conditions.
-
- Climate
Arctic algae show climate change
Sediment from Arctic lakes shows that much of the Northern Hemisphere has been warming for many decades.
