When a hydrophilic signaling molecule binds to the extracellular portion of a membrane receptor on a new cell, how does the "inside" of the cell know that the interaction occurred? (choose the one best answer)?

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:

d. organisms have cells with different shapes and functions.