Anatomical similarities and differences between various organisms allow us to reconstruct and infer evolutionary history and descent. The bones of the forelimbs (wing or arm) of
three animals are shown in the illustration.

the bones of the forelimbs arm

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.