What is cytotaxonomy , chemotaxonomy and numericaltaxonomy ?

Cytotaxonomy is the branch of biology dealing with the relationships and classification of organisms using comparative studies of chromosomes.
Chemotaxonomy is defined as the method of biological classification based on similarities in the structure of certain compounds among the organisms being classified.
Numerical taxonomy is a classification system in biological systematics which deals with the grouping by numerical methods of taxonomic units based on their character states.

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