Evolution at the molecular level is radically different from evolution at the morphological level. Sheldon 1987, as in Futuyma 1998. Changes in the mean number of ribs in eight lineages of trilobites. Irregular but mostly gradual changes are seen in most of the lineages. TCAGAAAAACAGTTTATTTTCTTTTTTTCTGAGAGAGAGGGTCTTATTTTGTTGCCCAGGCTGGTGTGCAATGGTGCATCAGAAAAACAGTTTATTTTCTTTTTTTCTGAGTGAGAGGGTCTTATTTTGTTGCCCAGGCTGGTGTGCAATGGTGCA.
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