The section Basics of ecology casts a glimpse to the world of ecology, examining how animals adapt to and interact with their environments. 

• 12. From the individual to the ecosystem examines the basics of ecology.
• 13. Ecosystem relationships discusses the relationships of different organisms within ecosystems.
• 14. Finnish ecosystems examines the most significant types of Finnish ecosystems.
• 15. The Baltic Sea discusses the natural features of the Baltic Sea.
• 16. Evolution discusses the gradual development of species.
• 17. Water ecosystems must be protected discusses how and why the diversity of water ecosystems should be protected.
• 18. Endangered species examines the concept of endangered species through two example species.

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