In this lesson, students compare various types of relationships among organisms (i.e., biotic interactions). Students will: explain the roles of producers and consumers, and predators and prey in an ecosystem. Explain the levels of order...

Explains what mutualism, commensalism, and parasitism are.

View graphics of a mimic octopus, frog fish, snake eel, hermit crab and clown fish. Discover how they form symbiotic relationships.