Practice!

Sample Problem

What is the feature do all chordates share? Check all that apply.

(A) circulatory system

(B) respiratory system

(C) cephalization

(D) diploblastic

(E) bilateral symmetry

(F) notochord

Solution

(A), (B), (C), (E), (F) are all correct. Chordates are not diploblastic – they are triploblastic – meaning they have three germ layers – an endoderm, mesoderm, and an ectoderm from which they develop.