Platyhelminthes were the first organisms to have:a

fully developed brain.
b. notochord.
c. central nervous system.
d. eyes


ANS: C
Flatworms have a primitive central nervous system. Some species have a complex bundle of nerve
cells acting as a rudimentary brain. Information can be found in the section The Worm Phyla Are the
Link to Advanced Animals.

Environmental & Atmospheric Sciences

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