Explain why scientists use evolutionary trees when classifying living organisms.

Evolutionary trees illustrate the evolutionary relationships between organisms, showing how species are related through common ancestry.
They reveal the degree of relatedness, indicating which organisms share recent common ancestors and which are more distantly related.
Because the trees are based on shared evolutionary history, the resulting classification reflects true biological relationships, unlike classifications that rely only on physical traits which can be misleading.
Molecular evidence, such as DNA sequence data, is used to construct these trees, providing reliable, objective information that improves the accuracy of the classification.