The document summarizes the food chain in the Mojave Desert ecosystem. It begins with producers like the Joshua tree and describes a typical 3-4 link food chain ending with predators like coyotes. However, man has replaced the wolf as the top predator through vehicles and hunting. This has endangered species like the desert tortoise and Joshua tree by disrupting the natural food chain. Some cities are trying solutions like wildlife crossings and fences to help preserve the food chain.