Secretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland.In contrast to excretion, the substance may have a certain function, rather than being a waste product.ecretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland.
The oldest shark fossils. The oldest fossilized evidence of prehistoric sharks comes from shark-like scales that date to 455 million years ago during the Ordovician Period, in Colorado. Some paleontologists do not agree that these scales are sufficiently shark-like to pronounce them sharks.
The size of the shark teeth are always measured in slant manner and not in terms of height.. The Meg tooth that Vito found is indeed 7.25 inch long in slant and much bigger than what M.D. Gottfried had got in 1996. Hence the maximum size estimate of Megalodon cannot be fixed at 52 feet long.