Summary
Ecosystems are complex networks where living organisms interact with each other and their environment. They include various habitats, bioaccumulation processes, and the impact of invasive species.
- Habitat — place where an organism or a community of organisms lives, including all living and nonliving factors. Example: A rainforest is a habitat for many species.
- Bioaccumulation — process where toxic substances accumulate in an organism over time. Example: Eutrophication leads to oxygen depletion in water bodies.
- Invasive Species — non-native species that spread rapidly and cause harm to native species and ecosystems. Example: Brown tree snakes in Guam have led to the extinction of many bird species.
Exam Tips
Key Definitions to Remember
- Habitat
- Bioaccumulation
- Invasive Species
Common Confusions
- Confusing habitat with ecosystem
- Misunderstanding bioaccumulation as a one-time event
Typical Exam Questions
- What is a habitat? A habitat is a place where an organism or a community of organisms lives.
- How does bioaccumulation affect aquatic life? It leads to oxygen depletion, harming aquatic organisms.
- What impact do invasive species have on ecosystems? They can cause native species to become extinct and disrupt food webs.
What Examiners Usually Test
- Understanding of different habitats and their importance
- Effects of bioaccumulation on ecosystems
- Impact of invasive species on native populations