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Ecology is the study of the interactions between organisms and their environment.
Some broad concepts you should have in your lessons include but are not limited to...
1. Adaptation - a particular genetic change that improves an organism's ability to survive and reproduce in a certain environment
2. Evolution - genetic change in a population of organisms over time
3. Natural Selection - changes in the gene pool from generation to generation
4. Symbiosis - close relationships between two or more species
5. Abiotic Factors - nonliving factors that affect a particular species such as weather
6. Population Growth - including birth and death rates
7. Population Regulation - predator/prey, disease, human impact, etc.
8. Life Histories - reproductive patterns of a species
9. Behavior Ecology - communication and aggression
10. Competition, Habitat, and Niche - survival, location, and roles
11. Succession - change in the amount of species following a disturbance
12. Ecosystems - interacting species and environments
13. Trophic Structure - stages of energy flow
14. Nutrient Cycles - movement of nutrients on a global scale
15. You may also wish to include a small review of the biology of the cell, and some weather and climate information as well.
Here are a few links that have tons of resources that you can adapt for your needs.
Project WILD
Project Learning Tree
Here you can find many full length streaming videos about various topic that can be very useful. Educator guides also available.
Scientific American Online Videos
Another list of full length streaming videos
UCTV
Good luck and let us know if you need anything else.