Collagen is the principal constituent of the fiber-network layer of our skin. More than a third of the body's protein is collagen, and it can account for an even higher percentage in particular parts of the body. Collagen makes up 70% of our skin tissue.
Sea lice are parasites of the Caligidae family of arthropods and are among the most notorious pests affecting cultured marine fish.They have a particularly large impact upon salmonid fish production.ea lice on a salmon. (Wikimedia Commons). Sea lice are parasites of the Caligidae family of arthropods and are among the most notorious pests affecting cultured marine fish. They have a particularly large impact upon salmonid fish production.
This phylum is divided into five classes: Asteroidea (sea stars), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies or feather stars), and Holothuroidea (sea cucumbers) ([link]). Perhaps the best-known echinoderms are members of the class Asteroidea, or sea stars.