What is the major developmental characteristic that shows the close relationship between echinoderms and chordates?
a. In both groups, the gut develops from front to back.
b. In both groups, all individuals have notochords during the larval stage.
c. In both groups, the gut develops from back to front.
d. In both groups, development occurs by continually adding skeletal elements.
e. Both groups have bilateral symmetry in all life stages.
Answer: c. In both groups, the gut develops from back to front.
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Charles Darwin
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