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This evolution takes place through changes in neural or brain mechanisms, hormonal changes, and patterns of learning, thereby revealing physiological and behavioral systems evolving in concert with one another (Beecher-Monas & Garcia-Rill, 2006). An example of this behavioral evolutionary process is the “fight or flight” response that humans have been genetically disposed to in order for early man to be able to escape dangerous predators. This stress response filled the human body with strength, stamina, and speed to escape a hazardous situation, and those who fought and won, or fled and lived, were the fittest and survived. In Western civilization today, this response is no longer needed for survival, however, the body still responds to stressors with this “fight or flight” response (Beecher-Monas & Garcia-Rill, 2006). Therefore, the behavior this response is meant to coincide with has evolved into one in which modern day stress is the “predator”, rather than a wild animal or a competing
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Common animal structures have also support evolution by using comparative anatomy to show common ancestral traits through stages of transition. The science of biogeography has examined living species and compared them to local fossils to determine whether they are similar in structure, and when they are, this is an indication that one is derived from the other. In addition, embryological studies examining similarities during development of various species. For instance, the “similarity of larval stages supports the conclusion that all crustaceans have homologous parts and a common ancestry” (“Science”, 1999). Further, scientist Motoo Kimura has also supported Darwin’s theories in the field of molecular biology with his theory of molecular evolution, which consists of the gradual, random replacement of molecular structures that evolve, the fit ones replacing those that are weak (Abdul,
Common animal structures have also support evolution by using comparative anatomy to show common ancestral traits through stages of transition. The science of biogeography has examined living species and compared them to local fossils to determine whether they are similar in structure, and when they are, this is an indication that one is derived from the other. In addition, embryological studies examining similarities during development of various species. For instance, the “similarity of larval stages supports the conclusion that all crustaceans have homologous parts and a common ancestry” (“Science”, 1999). Further, scientist Motoo Kimura has also supported Darwin’s theories in the field of molecular biology with his theory of molecular evolution, which consists of the gradual, random replacement of molecular structures that evolve, the fit ones replacing those that are weak (Abdul,