Using the tree below, which letter refers to the most recent common ancestor of green alga and moss?

Question

BlackTom AI · Accepted Answer

To determine the most recent common ancestor (MRCA) of green alga and moss, we trace where their lineages meet on the tree.
Option w: This letter labels a node that is higher up the tree, after the lineages leading to moss and green alga have already diverged. Therefore it cannot be the MRCA of green alga and moss.
Option x: This node sits on the branch leading toward pine and is downstream from the divergence that separates green alga from moss. It is not the point where green alga and moss share a common ancestor.
Option y: This node lies further down the chain than the MRCA of green alga and moss and corresponds to a shared ancestor of additional groups beyond green alga and moss. It does not represent their most recent shared ancestor.
Option z: This node is the point where the lineages leading to green alga and moss converge for the first time, meaning it is the most recent common ancestor of those two groups.
Option a: This is at the base of the tree and represents a much more ancient ancestor that predates the divergence of the specific lineages including green alga and moss. It is not the MRCA of just green alga and moss.
Thus, the MRCA of green alga and moss is the node labeled z, because it is the nearest shared ancestor before their lineages split.

Using the tree below, which letter refers to the most recent common ancestor of green alga and moss?单项选择题

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