Discover ecology You will learn the most important thing about the various natural zones from the rainforests to the poles, then dive into the sweet and salty waters of the planet.You will examine the food chains, photosynthesis, nitrogen and carbon cycles.You will understand what evolution is and how species interact.You will read about the various ways in which we pollute the planet, what threatens biodiversity and how we can live in harmony with the environment and deal with the changing climate.