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Plants, animals and other living organisms that exist on Earth have different structures and characteristics (physically and internally). The variety of body plans and structures, anatomical and behavioral differences are due to each one's structures of the DNA  molecule.
For instance, DNA molecules which are long chains connecting just four kinds of smaller molecules, whose precise pattern encodes genetic information. The closeness or remoteness of the relationship between organisms can be deduced from the extent to which their DNA sequences are alike. The 
The connection of organisms derived from likeness in their molecular structure closely matches the classification based on anatomical similarities.

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