A) the fossil record.
B) patterns of embryonic development.
C) comparative morphology and physiology.
D) nucleotide sequence patterns.
E) All of the above

A) The symmetry of the body
B) The structure of the body cavity
C) The segmentation of the body
D) External appendages
E) The larval morphology

A) any plane through the midline of its body.
B) any plane from its anterior to its posterior end.
C) any plane from its dorsal to its ventral surface.
D) any plane through the midline of its body from its anterior to its posterior end.
E) a single plane through the midline of its body from its dorsal to its ventral surface.