refer to the taxonomic groups that are consistently utilized in organism hierarchy classification. Sub-phyla, subclasses, suborders, subfamilies, subgenera, and variations are a few examples of .
:It is challenging to classify newly discovered creatures into established categories. As a result, the prefixes "super" and "sub" have been added to the existing categories, such as sub-kingdom, sub-phylum, super class, etc. These are categorized as . This has also made the placement of different taxa more soundly and scientifically.
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the layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 50 to 600 miles above the earth's surface.
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C.) crystalline solids
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The solid materials may be crystalline or amorphous. The concept of crystal structure is related to the organization of atoms in a geometrical form. Crystalline structures are present in various materials, where atoms distributed within their structure form a network called the crystalline lattice. Therefore, crystalline structures have salts, metals and most minerals. Crystalline structures are formed by unit cells that are their basic unit, as they constitute the smallest set of associated atoms found in a crystalline structure.
The molecules of the crystalline structures can have two types of bonds, the directional ones, which include the covalent and dipole dipole and the non-directional ones where the metallic, ionic, van der Walls bonds. When formed by ionic compounds, these crystalline structures can result in crystalline solids.
A seedling is a young plant sporophyte creating out of a plant incipient organism from a seed. Seedling improvement begins with germination of the seed. A common youthful seedling comprises of three fundamental parts: the radicle, the hypocotyl, and the cotyledons.
