BIO 1130 Study Guide - Lamprey, Skull, Terai
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BIO 1130 Full Course Notes
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The presence of a stomach in species separates the lamprey (sister group) from the rest of the species. This shows us that the presence of a stomach is the most primitive trait relative to the other traits. The presence of teeth on jaws on species distinguishes the species from the lamprey even more. This would allow the stomach to digest the food easier since the teeth can break down the food and prepare it for digestion. The presence of the lung 6(1) separates the sister group and the shark from the remaining species since all the other species have some form of a lung or a respiratory system. The shark is separated from the rest of the species after gaining the trait that allows it to eliminate nitrogenous wastes in the method of urea rather than the more ancestral method of ammonia. The presence of lungs separates the rest of the species from the shark and the outgroup.