Type of animal science: Classification Fields of study:Anatomy, developmental biology, ecology, entomology, histology, invertebrate biology,
marine biology, physiology Over 98 percent of all known animal species are invertebrates, animals without backbones. At the base of many food
webs, invertebrates provide nutrients to a wide range of other animals on land, underground, and in the seas. The diversity
within the invertebrates is amazing, ranging from single-celled protozoans to cephalochordates possessing
nerve cords, and claiming close relationship to vertebrates.
Type of animal science: Anatomy, classification, evolution Fields of study: Anatomy, paleontology Ichthyosaurs are extinct marine reptiles of the Mesozoic era. They were highly adapted to the marine habitat, having
evolved a dorsal fin, flippers, and a tail fin. These fleshy features are often preserved in spectacular fossils from the
Holzmaden and Solnhofen deposits in Germany.