Office of Training & Education 2. Â§1926.450 - SUBPART L. âUpdates the existing standard to include types of. scaffolds such as catenary and step and trestle. âAllows flexibility in the use of fall protection. systems to protect employees. âSimplifies language, eliminates duplicative, outdated provisions, consolidates overlapping. requirements.
Two whole shells, one closed and one open, of the marine bivalve Abra alba. Live marine venerid cockles, Austrovenus stutchburyi from New Zealand. A bivalve shell is part of the body, the exoskeleton or shell, of a bivalve mollusk.In life, the shell of this class of mollusks is composed of two hinged parts or valves. Bivalves are very common in essentially all aquatic locales, including saltwater, brackish water, and freshwater.wo whole shells, one closed and one open, of the marine bivalve Abra alba. Live marine venerid cockles, Austrovenus stutchburyi from New Zealand. A bivalve shell is part of the body, the exoskeleton or shell, of a bivalve mollusk.
Like fish, bivalve mollusks breathe through their gills. As filter feeders, bivalves gather food through their gills. Some bivalves have a pointed, retractable foot that protrudes from the shell and digs into the surrounding sediment, effectively enabling the creature to move or burrow.Bivalves even make their own shells.s filter feeders, bivalves gather food through their gills. Some bivalves have a pointed, retractable foot that protrudes from the shell and digs into the surrounding sediment, effectively enabling the creature to move or burrow. Bivalves even make their own shells.