Classification of organisms is based on relative similarities and differences in their internal and external structures. Similarities among organisms will allow us to group them and study the groups and classify them. Some basic characteristics will be shared by, most organisms. The more characteristics the two species will have in common, the more closely they are related. The more closely they are related, the more recently they have had a common. Ancestor so we can say that classification of a species is in fad a reflection of their evolutionary relationship.
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