If two modern organisms are distantly related in an evolutionary sense, then one should expect that

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Species may share similar physical features because the feature was present in a common ancestor (homologous structures). Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.

What is the best evidence of an evolutionary relationship between two organisms?

Today, scientists can compare their DNA. Similar DNA sequences are the strongest evidence for evolution from a common ancestor.
In evolutionary biology, convergent evolution is defined as the process whereby distantly related organisms independently evolve similar traits to adapt to similar necessities.
Which species are more related? In a phylogenetic tree, the relatedness of two species has a very specific meaning. Two species are more related if they have a more recent common ancestor, and less related if they have a less recent common ancestor.