In fact, there are more than 1 billion colds in the United States every year, according to the National Institutes of Health. And those facts change as scientists learn more about how colds work. Some people swear by zinc as a means of shortening a cold's duration, but research on that subject has been spotty.
The hard clam (Mercenaria mercenaria), also known as a quahog (or quahaug), round clam, or hard-shell (or hard-shelled) clam, is an edible marine bivalve mollusk that is native to the eastern shores of North America and Central America, from Prince Edward Island to the Yucatan YucatÃ¡n. peninsulaonfusingly, the ocean quahog is a different species, Arctica islandica, which, although superficially similar in shape, is in a different family of bivalves: it is rounder than the hard clam, usually has black periostracum, and there is no pallial sinus in the interior of the shell. Contents.
The ocean quahog is large bivalve that can reach a height of up to 10 cm. It grows rather rapidly during the first years, but the growth slows down after it reaches sexual maturity at the age of about 20 years, at the size of 6 to 7 cm. The ocean quahog can live to a very old age; the oldest individual measured in Icelandic waters was estimated to be about 400 years old. This makes the ocean quahog the longest lived animal on earth. The ocean quahog lives buried in the sediment so only a small opening of the shell is visible.