IOTA similar to some of other DLTs such as SPECTRE uses DAG (Directed Acyclic Graph) and contrary to many DLTs such as Bitcoin, Ethereum, Hyperledger erc does not use blockchain structure.

My question is "why" IOTA preferred DAG instead of blockchain-based structure?

"How" DAG structure can help us to improve problematics of blackchain-based DLTs?

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