What are some reasons why natural selection has not optimized the human oral ecosystem and why bacteria that cause tooth decay on able to thrive in human mouths

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Classification of Marine Organisms

Classification is a way of categorizing organisms that enables an easy process of identification of such organisms. All living things are classified by grouping them under specific categories. The grouping is done based on the close relativeness of the organisms. The classification tool requires knowledge of characteristics, differences, and similarities between different organisms.