Question

The chordate features shared by nonchordate are
A..bilateral symmetry
B...triploblasty and bilateral symmetry
C...metamerism
D...all of these
what's the answer and why?

Answer 1

"All of these is the answer"
All chordates show show metamerism.Though we cant observe externally metameric segmentation, internal organs show metameric distribution.The way, ribs, vertebrae and muscles arranged in the body show that there is segmentation in the body similar to what we see in some non chordates.Metameric segmentation is the repeated or regular arrangement of the organs of the body.