How is a bird building their nest in a tree commensalism? (2 or more sentences)

A Bird building their nest in a tree represents commensalism. This is due to the fact that the bird benefits while the tree doesnt benefit nor get hurt. Therefore by a bird building a nest in a tree is considered commensalism

what have fossils ever done for you

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: