The intermediate color or rather condition, in this case "roan", is a result of two alleles being codominant. Codominance occurs when the phenotype (or the physical expression of the gene) of a heterozygote individual expresses both the alleles in a pair of genes. In the given situation, both parents are homozygotes.
In geology, a key bed (syn marker bed) is a relatively thin layer of sedimentary
rock that is readily recognized on the basis of either its distinct
physical characteristics or fossil content and can be mapped over a very
large geographic area.[1]
As a result, a key bed is useful for correlating sequences of
sedimentary rocks over a large area. Typically, key beds were created as
the result of either instantaneous events or (geologically speaking)
very short episodes of the widespread deposition of a specific types of sediment. As the result, key beds often can be used for both mapping and correlating sedimentary rocks and dating them. Volcanic ash beds ( and bentonite beds) and impact spherule beds, and specific megaturbidites
are types of key beds created by instantaneous events. The widespread
accumulation of distinctive sediments over a geologically short period
of time have created key beds in the form of peat beds, coal beds, shell beds, marine bands, black in cyclothems, and oil shales. A well-known example of a key bed is the global layer of iridium-rich impact ejecta that marks the Cretaceous–Paleogene boundary (K–T boundary). Please let me know if it works.
Evolved from prokaryotic cells
Close friend and supporter of Charles Darwin especially in his theory of evolution. 1868 examined samples of mud recovered from the deep-sea floor 11 years back to discover a surface layer of thick mucus-like material with small embedded particles on the samples. Bathybius haeckeliiafter famous naturalist Ernst Haeckel Subdivisions looked to move so he assumed they were a form of living protoplasm and he named the "organism".
The fibrous proteins which are found in connective tissues of the animals are either collagen, elastic, or reticular fibers. This collagen fibers provide strengths to the connective tissues.
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