Tidepool Tim
15 foot long sugar kelp.
Elvers, or glass eels are found 'running' from the sea, up the watershed through brackish rivers where they are harvested by local fishermen in nets.
A lion's mane jellyfish brought to the surface by a rising current.
Sharks are apex predators at the top of the food web. They monitor marine species abundance, affecting carnivores, herbivores, and autotrophs.
The tooth on the left side of the image has one root, and the molar on the right has three. The teeth are each made from the same materials distributed differently: enamel, dentin, and cementum housing a pulp cavity.
Shark scales (placoid scales) and shark teeth are made of the same materials and have the same general structure!