Animals that at least at some stage in their development possess a stiff, rod-like structure running along their back, called a notochord.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60...

Journey through the evolution of fish, from the first vertebrate to the fish species that would eventually evolve to crawl onto land. Biology - Animal Kingdom - Learning Points. The first fish was called Haikouichthys, and it evolved in...

Here we explore interesting facts about Electric Rays, cartilaginous ray-fish that can generate up to 200 V of electricity to attack their prey or defend against predators.<br/>

KINE 3135 Biomechanics of Joints