Ecosystems
What Is Biodiversity, and Why Does It Matter?
Biodiversity is more than a long list of animals and plants. It is the web of life that keeps ecosystems, and us, alive. Here is what biodiversity actually means, the three levels it works on, and why its loss should worry everyone.
What Is a Food Chain, and How Does It Work?
Grass feeds a rabbit, a rabbit feeds a fox, and the Sun feeds all of it. A food chain is the simple thread that ties every living thing to the energy of sunlight. Here is how it works, and why the chains are always short.