A: Morphological phylogeny.

B: Molecular phylogeny.
-What is true of the deuterostomes in the molecular phylogeny (B)that is not true in the traditional phylogeny (A)?
A) Deuterostomia is a clade.
B) To maintain Deuterostomia as a clade, some phyla had to be removed from it.
C) Deuterostomia now includes the Acoela.
D) It is actually a grade, rather than a clade.
E) It diverged from the rest of the Bilateria earlier than did the Acoela.

Question

A: Morphological phylogeny.
  
B: Molecular phylogeny.
-What is true of the deuterostomes in the molecular phylogeny (B)that is not true in the traditional phylogeny (A)?
A) Deuterostomia is a clade. 
B) To maintain Deuterostomia as a clade, some phyla had to be removed from it. 
C) Deuterostomia now includes the Acoela. 
D) It is actually a grade, rather than a clade. 
E) It diverged from the rest of the Bilateria earlier than did the Acoela.

Quizplus · Accepted Answer

In the molecular phylogeny (B), Deuterostomia is a clade that includes the Acoela, while in the traditional phylogeny (A), Deuterostomia is not a clade, and some phyla had to be removed from it to maintain it as a monophyletic group. Therefore, choice B is correct because it reflects the difference between the two phylogenies.

A: Morphological Phylogeny. B: Molecular Phylogeny