Phylogenetic trees can be constructed using a variety of data. Today there is a tendency to use:

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morphological data rather than molecular data as there are more morphological factors that can vary among the species

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molecular data rather than morphological data as there are more molecular factors that can vary among the species

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proteins found in the blood samples of organisms as they are species specific

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cell membrane lipds as cell membranes are common to all living things

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