"Platyhelminthes" exhibit: a. Radial symmetry and no cephalization b. Bilateral symmetry and no cephalization c. Radial symmetry and cephalization d. Bilateral symmetry and cephalization e. none of the above

The correct answer is option b. "Bilateral symmetry and no cephalization".

Explanation:

"Platyhelminthes" are a type of flatworms that lack circulatory and respiratory organs, and have an unique digestive cavity. Two characteristics that define platyhelminthes are they have bilateral symmetry and no cephalization. Bilateral symmetry means that if you draw a line from the head to the tail of the flatworm, you will obtain two mirror sides. Regarding cephalization, platyhelminthes are considered not fully cephalized as they only have the beginnings of cephalization.

the answer is b

Explanation:

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