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In modern systematics, which dimension or character is given the greatest importance in classification?

Answer and explanation

Correct answer: The evolutionary history and genetic relationships of organisms

The correct answer is A. Modern systematics aims to classify organisms according to their natural relationships and evolutionary history. Scientists therefore examine evidence such as fossils, comparative anatomy, embryology, cell structure, biochemical characteristics, DNA sequences, and other genetic information. Genetic and molecular evidence is especially valuable because it can reveal relationships that are not obvious from outward appearance. Option B is incomplete: morphology is useful, but it is not the only or highest basis in modern systematics. Option C describes where an organism lives, which may help classification but does not by itself prove ancestry. Option D concerns human usefulness, not biological relationship. A good memory cue is: modern systematics asks “who is related to whom, and through what evolutionary history?”

Related tags

SystematicsEvolutionGeneticsClassificationTaxonomyBinomial NomenclatureTaxonomy Binomial NomenclatureThe Living WorldBiology

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