Hank introduces us to ourselves by taking us on a journey through the fascinatingly diverse phyla known as chordata. And the next time someone asks you who you are, you can give them the facts: you're a mammalian amniotic tetrapodal...

Many people presume that all members of Chordata have a backbone, but that actually is not true. Vertebrates have backbones, meaning members of subphylum Vertebrata. There are two other subphyla within Chordata, those being...

An animal without a backbone or spinal column. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract concepts...

We know about atoms and molecules and cells, so now we are ready to learn about complex multicellular life. Of course the multicellular species that is of the most interest to us is Homo sapiens, because that's us! The human body is...