DNA Similarity and Evolutionary Relationships
More distantly related species have had more time elapse since they shared a common ancestor; therefore, they have had more time for mutations to accumulate in their DNA. Closely related species have had little time to accumulate mutations since their last common ancestor, so their DNA sequences are much more similar.
There are two panels with two animals in each. The top panel shows two different lizard species. The bottom panel shows a snake and a lizard.