Flexi Says: If invertebrates disappear from food webs it would eventually lead to the collapse of the entire ecosystem. This is because invertebrates are an important source of food for most bigger vertebrates, and at the same time they help in biological control of pests. This maintains the ecological balance in the environment. The aid in pollination, decomposition of dead matter, and some are also valuable environmental indicators. They create and maintain soil quality by burrowing and adding minerals through their excrements.