Why A Block have a Merkle root hash?

Why A Block have a Merkle root hash?

That is the question, why a block needs to have a Merkle root hash, as Iundestand, once a block is mined the hash value of this block is stored at the header of the next one so, it generates the chain.

Is some data is changed, the hash will not be the same so, it is possible to notice that some data is changed.

So I see that storing the merkle root hash at the header of a block is unuseful as it is doing the same thing as hash pointer of the next block of the chain is doing

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