Evolution of organisms shows the development of structure to function

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 chordates. Possessing a dorsal notochord or hollow nerve cord is the significant development of chordates. The nerve cord is a flexible structure and allows the body of the organism to extend. There are other important developments, too, such as metameric arrangement of organs and body regions, perforated pharynx, post-anal tail, large coelom, and ventral heart. These are more advance developments of phylum Chordates compare to the other phyla such as annelids, moluccas and so on. Chordates divide into three main clades such as cephalochordates, urochordates and vertebrates. The subphylum vertebrate shows even more advance development of structure of organisms. It is important to know more about vertebrata since human and other animals such as dogs, cows, birds, and the other most familiar animals are fallen into the subphylum vertebrates (Campbell et al. 2008).

The major development of vertebrata is the replacement of notochord by the segmented vertebrae and possession of cranium, which protect...

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...as Geckos have specific feet that help their locomotion proving the marvel of the nature.

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