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An important criterion for modern day classification is

1. resemblances in morphology
2. anatomical and physiological traits
3. breeding habits
4. presence or absence of notochord

Correct answer: anatomical and physiological traits

Solution

Modern taxonomy prefers anatomical and physiological features because they better reflect evolutionary relationships than superficial resemblance. Morphology can be misleading due to convergent evolution, while internal traits are more informative.

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