Ecology is the scientific study of how living things interact with each other and with their environment. An ecologist might study how wolves affect deer populations in a forest, how coral provides homes for fish in the ocean, or how earthworms improve soil for plants.

In a way, ecology examines how nature's “house” works. Everything in an ecosystem is connected: plants make oxygen that animals breathe, animals spread seeds that grow into new plants, decomposers break down dead matter that feeds the soil. When you study ecology, you're learning about these countless relationships and how they keep nature balanced.

Ecology helps us understand why protecting one species might save many others. For instance, when beavers build dams, they create ponds that dozens of other species depend on. Beavers are what ecologists call a keystone species because removing them would dramatically change their entire ecosystem.

People sometimes confuse ecology with environmentalism, but they're different: ecology is the science of studying natural systems, while environmentalism is about protecting them. However, ecology gives us the knowledge we need to make smart decisions about caring for the natural world.