How are the hormones of the endocrine system able to affect only certain cells in the body

Because only those target cells have receptors for that particular hormone.

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:

this would be a math