It can be inferred from the passage that the author believed which of the following about the 'shared characteristics' mentioned in the passage?

This choice misrepresents the relationship between the groups. While there are unique features in limb form and musculature, the passage emphasizes shared characteristics rather than focusing solely on the unique aspects of insects and crustaceans.

This choice contradicts the main inference from the passage. The author suggests that the shared characteristics do not imply close evolutionary relationships, as they do not stem from a common ancestor with all traits.

This option incorrectly interprets the author's stance. The shared characteristics do contribute to the classification of the groups as arthropods; the author is concerned with the ancestry of these traits rather than their classification.

While shared characteristics can indeed support convergent evolution, this choice does not align with the author's focus on the absence of a single ancestor possessing all traits. The author is analyzing these traits in the context of evolutionary lineage rather than providing evidence for convergent evolution.