Free About 1 hr0 learners Rev. 2026-10-28 0

On the island of Guam, a snake that probably slipped ashore in military cargo helped turn quiet forests into tangles of spider webs. It ate the birds, and the birds had been eating the spiders and carrying the seeds. Ecology is the science of chains like that one, where pulling a single thread tugs on things nobody thought were connected, and where the obvious explanation is often only half the story.

You will learn why big predators are always rare, why a single added nutrient can turn a whole lake green, what really happened when wolves came back to Yellowstone, and why a famous statistic about vanishing wildlife is so often misquoted. Along the way you will weigh the competing ways people try to protect nature, from fenced parks to rewilded farms to land returned to Indigenous hands, and come away able to read news about extinction, invasions and conservation with a sharper and fairer eye.

Levels

  1. 1 1. What Ecology Studies 5-question quiz
  2. 2 2. Energy Flow and Food Webs 5-question quiz
  3. 3 3. Populations and Carrying Capacity 5-question quiz
  4. 4 4. Communities: Competition, Predation and Keystones 5-question quiz
  5. 5 5. Ecosystems, Succession and Biomes 5-question quiz
  6. 6 6. Biodiversity and How It Is Measured 5-question quiz
  7. 7 7. Extinction Past and Present 5-question quiz
  8. 8 8. Conservation: Protecting What Remains 5-question quiz

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