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antiquity to the present as a gemstone, aber is made into a variety of decorative objects Amr is used in jewelry. It has also been used as a healing agent in folk medicine There are five classes of amer, defined on the basis of their chemical constituents. Because it originates as a soft, sticky tree resin, aber sometimes contains animal and plant material as inclusions Ambeoccurring in coal seams is also called resinite, and the term ambrite is applied to that found specifically within NeZand coal seams For this to happen, the resin must be resistant to decay. Many trees produce resin, but in the majority of cases this deposit is broken down by physical and bial processes. Exposure to sunlight, rain, microorganisms (such as bacteria and fungi), and extreme temperatures tends to disintegrate resin. For resin to survive long enough to become amr, it must be resistant to such forces or be produced under conditions that excludethem softened amer being forced through holes in a metal plate. The product is extensively used for the production of cheap jewelry and articles for smoking. This pressed aber yields brilliant interference colors in polarized light. Amr has often been imitated by other resins like copal and kauri gum, as well as by celluloid and even glass. Baltiaber is sometimes colored artificially, but also called The resin's most popular use was, however, for ornamentation—easily cut and polished, it could be transformed into beautiful jewelry. Much of the most highly prized aer is transparent, in contrast to the very common cloudy aer and opaque aber. Opaque ber contains numerous minute bubbles Red mangroves, which can survive in the most inundated areas, prop themselves above the water level with stilt roots and can then absorb air through pores in their bark (lenticels). Black mangroves live on higher ground and make many pneumatophores (specialised root-like structures which stick up out of the soil like straws for breathing) which are also covered in lenticels These "breathing tubes" typically reach heights of up to 30 cm, and in some species, over 3 m. The four types of pneumatophores are stilt or prop type, snorkel or peg type, knee type, and ribbon or plank type. Knee and ribbon types may be combined with buttress roots at the base of the tree. The roots also contain wide aerenchyma to facilitate transport within the plantsowever, if there are internal stresses present, stomatal tissue expansion or damage can result. Woody plants, with vascular and cork cambia activity, are prime candidates for the latter. This necessity of aeration structures that combated stomatal damage in the presence of the secondary tissues of these woody plants is where lenticels are believed to have evolved. The extinct arboreal plants of the genera Lepidodendron and Sigillaria were the first to have distinct aeration structures that rendered these modifications. "Parichnoi" (singular: parichnos) are canal-like structures that, in association with foliar traces of the stem

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