Question

according to the phylogenetic tree, when did the most recent common ancestor between the chinese tree shrew and humans exist? a 6 million years ago b 26 million years ago c 90 million years ago d 96 million years ago

Explanation:

To determine the most recent common ancestor (MRCA) of the Chinese tree shrew and humans from a phylogenetic tree, we analyze the divergence times. The MRCA exists at the time when their lineages last shared a common branch. Among the options, 90 million years ago (option C) aligns with typical phylogenetic data for the MRCA of these species, as the other options (6, 26, 96 mya) either represent more recent (6, 26) or slightly older (96) divergence events than the accurate MRCA time.

Answer:

C. 90 million years ago