The modern day classification is mainly based on

resemblance in morphology

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anatomical & physiological traits and the phylogeny

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breeding habits

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presence or absence of notochord

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Solution

The correct option is B anatomical & physiological traits and the phylogeny
Modern day classification is mainly based on the external and internal (anatomical) structure, along with the structure of cells, development process, physiological traits and ecological information of organisms. It is also based on phylogeny of the organism as well.

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