What is cephalization? ( plz.... in easy language )

In the simplest sense, cephalization means having a head. In fact, the term originates from the Greek word for head, kephale. But there's a little more to it than that. Think about how important your head is and what it contains. Internally, it holds your brain, and externally, it has your primary sense organs (your eyes, nose, ears, and mouth). This is the real essence of cephalization, the concentration of nervous tissue into a single, controlling organ and the organization of sense organs into one area at the anterior (head) end of the body as opposed to the posterior (tail end.)
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