Hydrogen bonds can only form between ? 1.nitrogenous 2phoephates 3. Nucleotides

Your answer would be 1) Nitrogenous. Hydrogen bonding occurs only when hydrogen is bonded with one of three of the following elements: Fluorine, oxygen, and NITROGEN.  

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

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