Tag «lessons»

Nitrogen cycle | Ecology | Khan Academy

Nitrogen cycle  | Ecology | Khan Academy

– [Voiceover] Nitrogen often gets less attention than carbon or oxygen, but nitrogen is very important to life as well. And like carbon and oxygen, it cycles through our biosphere. Now, one thing that’s maybe surprising about nitrogen, if you haven’t studied it much, is that it is very, very common in our atmosphere. 78% …

A Million Sharks

– [Voiceover] Sharks are one of the scariest animals in the ocean and almost nothing else dares to eat them. But if nothing’s eating sharks, then why isn’t the ocean just overrun with sharks? We can answer the question with “food chains.” Now to understand food chains, we first have to talk about food and …

Ecosystems and biomes | Ecology | Khan Academy

Ecosystems and biomes  | Ecology | Khan Academy

– [Voiceover] So, just as a bit of review. If we take the members of a certain species that share the same area, we call that a population. Population. All of the organisms in this particular population will be members of the same species. There could be other members of that species that aren’t in …

Ecological Succession: Nature’s Great Grit

Ecological Succession: Nature’s Great Grit

Captioning is on! To turn off, click the CC button at bottom right. Follow the amoebas on Twitter (@amoebasisters) and Facebook! We love Disney movies and we have to say—Lion King is one of our favorites. And like a lot of Disney movies, it has a happy ending. We’re not going to give spoilers just …