Explain why combed yarns are more costly than carded yarns of the same fiber content and size

Combed yarns are more costly than carded yarns of the same fiber content and size because more fibers are fluffed up and aligned to create a smoother yarn. Carded yarns need lesser fibers creating  slightly fuzzier yarn. More fibers used means higher cost. 

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

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