An obsolete taxon, the "Radiata," included all phyla whose adults had True radial symmetry. Today, the "Radiata" is more correctly considered to be
1) a clade.
2) a grade.
3) monophyletic.
4) paraphyletic.
5) polyphyletic.
A)1 and 2
B)1 and 3
C)2 and 4
D)2 and 5
E)1, 2, and 3

Question

Quizplus · Accepted Answer

The "Radiata" is considered a grade because it groups organisms based on similar characteristics (radial symmetry) rather than evolutionary lineage, and it is paraphyletic because it does not include all descendants of a common ancestor.

An Obsolete Taxon, the "Radiata," Included All Phyla Whose Adults