Question

which describes the modern classification system?
based on similar appearances
called darwinian classification
based on evolutionary relationships
called linnaean classification

Explanation:

• "based on similar appearances": Traditional classification (like early Linnaean) used this, but modern is about evolution, so incorrect.
• "called Darwinian classification": There's no specific "Darwinian classification" term for the modern system; Darwin's work was on evolution, but the classification system is phylogenetic.
• "based on evolutionary relationships": Modern biological classification (phylogenetic) groups organisms by their evolutionary history/relationships, correct.
• "called Linnaean classification": Linnaean is traditional, based on morphology, not modern.

Answer:

based on evolutionary relationships