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Evolution of organisms shows the development of structure to function

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Grouping of organisms according to the similar anatomy helps to understand their evolution and how those organisms have being developed over millions of years. Similarly, structures of organisms have developed over years to function better to survive on the earth. Even though some organisms are unicellular, while some are multicelliular, both types of organisms have got particular structure to function that helps to fulfill their needs. Thus, structure and function of the organisms, including humans, portray the incredible creations of the nature (Campbell et al. 2008).
The phylogenic tree reveals the evolutionary history of animals simply. In this phylogenic tree, humans and other animals that are familiar to us are included in phylum …show more content…

Even though every class has some common attributes such as segmented vertebrae, specialization of the structure occurs in each class according to their function and the surviving environment. As such, organisms in class reptilian have got distinctive features that of aves, chondrichthyes, mamalia, and so on (Campbell et al. 2008). The class reptilia is mostly terrestrial organisms. Class reptilian is included snakes, lizards known as Gecko, crocodiles, and so on. The amniotic egg is the most significant feature of reptilian. The amniotic egg is an essential stage of the life cycle of reptilian that helps them to complete their life cycle without water. The body structure of reptilians is specialized to survive in terrestrial environment. Consequently, many reptilians have got four limbs for locomotion. Locomotion is essential for reptilians to live in terrestrial environments (Campbell et al. 2008). Furthermore, the organisms that are categorized into the class reptilian, have different distinguish figures such as Gecko has sticky limbs that can hold them to the smooth walls and run faster on it (Autumn and Peattie 2002).
Gecko, have got all other characteristics of the vertebrae. Geckos are able to climb walls and have the ability to move on the surface such as upside down on ceilings against the gravity (Autumn and Peattie 2002). Specialized feet of Gecko assist their

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