Portland, Maine â For the first time, scientists have figured out how to determine the age of a lobster â by counting its rings, like a tree. Nobody knows how old lobsters can live to be; some people estimate they live to more than 100.
The lamina propria (more correctly lamina propria mucosae) mucosÃ¦ is a thin layer of loose connective, tissue or dense irregular connective, tissue which lies beneath the epithelium and together with the epithelium constitutes the. mucosa
The frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance, which was referred to in the early literature on diatoms as pectin, a fiber most commonly found in cell walls of plants.This layer is actually composed of several types of polysaccharides.he frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance, which was referred to in the early literature on diatoms as pectin, a fiber most commonly found in cell walls of plants. This layer is actually composed of several types of polysaccharides.