Body: "Invertebrates" is the field of animals that neither possess nor develop a backbone.
Richard C. Brusca, Jan Pechenik are some authorities of "Invertebrates".
taxonomy, characteristics, classification, history are a few categories of "Invertebrates".
understand their impact on the environment (i.e. soil); gain a broader understanding of life and biology is some of the cause to investigate "Invertebrates".