According to this figure, chimpanzees are most closely related to ______ .

Question

BlackTom AI · Accepted Answer

To tackle the question, I’ll examine what the figure conveys about relationships among primates over time.
Option a: bonobos. The diagram shows chimpanzees and bonobos as the closest branches near the top of the tree, sharing a more recent common ancestor with each other than with humans, orangutans, or gorillas. This aligns with the well-supported view that chimpanzees and bonobos are sister taxa.
Option b: humans. While humans are indeed closely related to chimpanzees and bonobos, the figure places humans on a separate line branching off further back relative to the chimpanzee/bonobo split, indicating they are less closely related to chimpanzees than bonobos are. Therefore, humans are not the closest.
Option c: orangutans. Orangutans lie on a separate branch that diverged earlier from the lineage leading to African apes and humans. The distance in time on the tree and the branching pattern show orangutans are more distantly related to chimpanzees than bonobos are, so this option is incorrect.
Option d: gorillas. Gorillas are another branch that diverges before the split between the chimpanzee/bonobo lineage and humans. While they are still relatively related to us compared to orangutans, the diagram demonstrates that bonobos (along with chimpanzees) form a closer clade to humans than gorillas do, making gorillas less closely related to chimpanzees than bonobos are.
Across all options, the key idea is that the figure clusters chimpanzees with bonobos as the closest relatives, with humans next closest, and more distant connections to orangutans and gorillas. This supports the interpretation that bonobos are the closest among the listed choices. 
Therefore, option a is the most accurate choice given the depicted phylogeny.

According to this figure, chimpanzees are most closely related to ______ .单项选择题

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