Why do scientists arrange the organisms on the tree below with some organisms closer than others?

Responses
A The organisms that are closest to one another are the same organismsThe organisms that are closest to one another are the same organisms
B The organisms that are closest to one another evolved from each otherThe organisms that are closest to one another evolved from each other
C The organisms that are closest to one another share the most similar DNAThe organisms that are closest to one another share the most similar DNA
D The organisms that are closest to one another share the most similar RNA

1 answer

The best response is C: The organisms that are closest to one another share the most similar DNA.

In phylogenetics, organisms are often arranged in a tree (phylogenetic tree) based on their evolutionary relationships, which are often determined by genetic similarities. Closely related organisms usually have more similar DNA sequences because they share a more recent common ancestor.