Science / Biology / Vertebrate: Any animal having a segmented vertebral column; members of the subphylum Vertebrata; include reptiles, fishes, mammals, and birds.


Science / Biology / Birds: Taxonomic class of terrestrial vertebrates that are characterized by endothermy and feathers; descended from some group of reptiles (or possibly dinosaurs). MORE

Endogenous Retrovirus

Health / Disease / Endogenous Retrovirus: Integrated retroviruses derived from infection of the germline (egg or sperm) of an ancestral organism. All vertebrates are thought to carry numerous endogenous retroviruses. MORE


Health / Disease / Antibody: Proteins that are found in blood of vertebrates, and are used by the immune system to identify and neutralize foreign objects, such as bacteria and viruses. MORE


Science / Biology / Ventral: Term applied to the lower side of a fish, or to the chest of a land vertebrate. MORE


Science / Biology / Reptiles: Taxonomic class of vertebrates characterized by scales and amniotic eggs; the first truly terrestrial vertebrate group. MORE

Nerve Net

Science / Biology / Nerve Net: An interconnected mesh of neurons that sends signals in all directions; found in radially symmetrical marine invertebrates, such as jellyfish and sea anemones, that have no head region or brain. MORE