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A copying pencil, also an indelible pencil or chemical pencil, [1] is a pencil whose lead contains a dye. The lead is fabricated by adding a dry water-soluble permanent dye to powdered graphite —used in standard graphite pencils—before binding the mixture with clay .
Biological illustration has traditionally employed the techniques of using carbon dust, color pencil, stipple pen and ink, lithography, watercolor and gouache; however, digital illustration has recently become more important in the field. Every professional scientific illustration begins with multiple rough sketches.
More generally a phylum can be defined in two ways: as described above, as a group of organisms with a certain degree of morphological or developmental similarity (the phenetic definition), or a group of organisms with a certain degree of evolutionary relatedness (the phylogenetic definition).
A permanent marker or indelible marker is a type of marker pen that is used to create permanent or semi-permanent writing on an object. Description
A pencil (/ ˈ p ɛ n s ə l / ⓘ) is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand. Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface.
What: the identification of the organism recorded; Where: The locality where the organism was seen; When: the date (and time) when the organism was recorded; Who: the person or persons making the observation; Additionally a variety of additional information is often necessary to increase the value of any biological record, including:
The pygmy mammoth is an example of insular dwarfism, a case of Foster's rule, its unusually small body size an adaptation to the limited resources of its island home.. A biological rule or biological law is a generalized law, principle, or rule of thumb formulated to describe patterns observed in living organisms.
Obtaining such genetically identical organisms (or pure strains) can be useful; this is done by spreading organisms on a culture plate and starting a new stock from a single resulting colony. [ 12 ] A biofilm is a colony of microorganisms often comprising several species, with properties and capabilities greater than the aggregate of ...