Owls have many adaptations. They allow them to survive in their chosen habitats. <span>Owls are adapted to their nearly treeless environment </span>because they can camouflage into the same colour as the environment or <span>into the same colour as a branch an that is where owls sit. Owls have also fringed fetahres, so they can fly silently. </span>
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It may alter the sequence of simple sugars in insulin molecules.
<span>Pancreas. The pancreas does so by having beta cells that secrete a certain amount of insulin after consumption of food. There are then delta cells that regulate the beta cells, and then gamma cells that in turn regulate the delta cells.</span>
Group IV of the Periodic Table of the Elements contains carbon (C), silicon (Si) and several heavy metals. Carbon, of course, is the building block of life as we know it. So is it possible that a planet exists in some other solar system where silicon substitutes for carbon? Several science fiction stories feature silicon-based life-forms--sentient crystals, gruesome golden grains of sand and even a creature whose spoor or scat was bricks of silica left behind. The novellas are good reading, but there are a few problems with the chemistry.
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CRYSTALLINE CREATURES? Silicon can grow into a number of lifelike structures, but its chemistry makes it unlikely that it could be the basis for alien life-forms.</span>
Indeed, carbon and silicon share many characteristics. Each has a so-called valence of four--meaning that individual atoms make four bonds with other elements in forming chemical compounds. Each element bonds to oxygen. Each forms long chains, called polymers, in which it alternates with oxygen. In the simplest case, carbon yields a polymer called poly-acetal, a plastic used in synthetic fibers and equipment. Silicon yields polymeric silicones, which we use to waterproof cloth or lubricate metal and plastic parts.
