Question

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

Explanation:

Modern classification system is based on evolutionary relationships. Linnaean classification was an early system based mainly on physical characteristics. The term "Darwinian classification" is not the standard name for the modern system. And basing solely on similar appearances (like Linnaean in part) is not how the modern system works as it incorporates evolutionary history.

Answer:

based on evolutionary relationships