Shark teeth vary in size and shape according to what they eat ... whereas in rays they are found on the underside of the body. The gills are packed with blood vessels, which absorb oxygen from ...

A dark grey silhouette depicting the previously reconstructed Otodus megalodon body form based largely on the modern white shark ... of body elongation, the shape of the head, and the outline ...

The team behind the new study says the strength of the spinal column suggests a more slender body shape than that of a great ...