The Following Questions Are Based on the Description Below

The following questions are based on the description below.
A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage) .
-What does recent evidence from molecular systematics reveal about the relationship between grades and clades?

A) They are one and the same.
B) There is no relationship.
C) Some, but not all, grades reflect evolutionary relatedness.
D) Grades have their basis in, and flow from, clades.
E) Each branch point on a phylogenetic tree is associated with the evolution of a new grade.

Correct Answer:

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