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 TOPIC 9: Ecology Please use the podcast from Council Rock High School for TOPIC 9 to guide you. The podcast can be found at 1. Write down the levels of ecosystem organization from smallest to largest 2. ________________ make their own food, while ________________________ eat other organisms for food. 3. When you move up an energy pyramid, the amount of available energy (circle one) ↑ ↓ 4. What is the difference between a food chain and a food web? 5. What is the difference between abiotic and biotic factors? 6. Explain the following organisms interactions a. Competition b. Predation c. Symbiosis i. Mutualism ii. Commensalism iii. Parasitism 7. _____________________ species are those that are naturally found in a location, while _______________ species are accidentally or purposefully introduced to a new area 8. Explain the difference between a. Threatened b. Endangered c. Extinct 9. What is succession? Biology Keystone Review—2012‐2013