Shared features of b and t lymphocyte function include: ?
(a) specificity of receptors
(b) diversity of receptors
(c) regulation of activation
(d) memory(e) all above

the answer is c) an oak tree

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: