An ecosystem is an environment . In an ecosystem living and nonliving things interact with each other . Living things get there energy from the sun and living things get there energy from other living things . If something gets extinct in a food web then the whole entire food web will be messed up because its predator will have nothing eat and then it will die and then the animal who dies predator won’t have any food then die . Then that will keep happening . My food web is a desert food web .