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The molecular clock has been useful to determine the phylogenetic relationships of species based on the assumption that:

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The molecular clock has been useful to determine the phylogenetic relationships of species based on the assumption that:

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According to the phylogenetic tree diagram, modern birds are most closely related to ___________.

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First of all, the cohesive and adhesive properties of the water molecules fascilitate this. Water molecules stick together and with the walls of the vessels, creating a column of water which doesn t break easily. Moreover the xylem vessels of the tree are very narrow increasing the pressure. Finally, transpiration is taking place as water from the leaves evaporate, thus a continuous osmotic gradient is being created, causing water to be drawn up the tree

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