Verified Answer :

Cephalization is an evolutionary process in which a living organism started to produces a head region with sensory organs.

The first organism to show cephalization were flatworms.

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Answer:

Flatworms

Explanation:

  • Cephalization is the process of development of the end of the animal where the head is formed.
  • The early organisms did not have any well defined anterior end but the  Higher animals started showing cephalization which allowed them to move in a particular direction and the nerve cells started gathering in front.

This was accompanied by bilateral symmetry and since the flatworms are bilaterally symmetrical, they were the first ones to show cephalization.

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