Primitive vertebrates with an adaptive immune system A key organ found in our adaptive immune system are more common than previously assumed: Max Planck researchers have demonstrated the presence of ...

The sympathetic nervous system, which enables the fight-or-flight response, was thought to be present only in jawed vertebrates. Analysis of a jawless vertebrate suggests that this system might be a ...

v. 1. Propaedeutics to comparative neurology.--v. 2. Invertebrates and origin of vertebrates.--v. 3, pt. 1. Structural elements: biology of nervous tissue.--v. 3, pt ...

This is Blob. Blob can't do much, like lift his own head. He doesn't even have a head. If Blob had been born with a spine, or backbone, he would have been a vertebrate. If we give Blob some legs and a ...

In this outdoor activity, your class will go on a bug hunt and become zoologists. They will come up with their own classification systems to sort common invertebrates into groups. This activity can be ...