Which corresponds to the most recent common ancestor on a phylogenetic tree?

The answer is - The Root Node

Explanation:

The Phylogenetic tree shows the relationship between different organisms and their path of evolution through time. It is a graphical representation that links organisms from a common ancestor down to their different descendants. The most recent common ancestor of all the taxa or organisms on a phylogenetic tree is represented by a root node as it is the very first parent or node.