Imagine an ecosystem without any light or oxygen, where living things convert carbon dioxide into food. This ecosystem is thriving and might just be the largest ecosystem on our planet, yet we know very little about it. The lesson...

Oceans represent more than 80 percent of all habitats, yet we know less about them than most other habitats on the planet. The instructor introduces the epipelagic, mesopelagic, bathypelagic, twilight, and midnight zones in the ocean....