From my understanding of the Bitcoin network, Merkle Hash Tree is used on a block level, where each transaction is a leaf of the tree (except the situation that if transaction count is odd, the last leaf is a duplicate) and the root is a mingled hash of all the transactions in a block.
Today I read this post, in which it says
Merkle trees, in turn, use the hash to connect each block.
This is a bit ambiguous to me. Does that mean a Merkle Tree is also used on a network level, where each block is a leaf of the tree? I thought Bitcoin uses a linear chain architecture, similar to a singly linked list.
Is Bitcoin Blockchain a linear chain or a Merkle Tree architecture? Thank you.