It's About Time
Factors Affecting Population Size
How do we predict future population growth? Young researchers investigate various factors affecting the size of our population. As they calculate and interpret graphs to determine factors that could potentially affect increases...
Khan Academy
Khan Academy: What Is Ecology?
A webpage giving an overview of ecology. Learn about the biotic and abiotic factors that make up an ecosystem as well as the different levels of ecology.
Science Struck
Science Struck: The 6 Chief Levels of Organization in Ecology
Describes six levels of organization in the biological world - individual species, population, community, ecosystem, biome, and biosphere.