verified transaction in a block is verfied by one node? i want to know whether block is a combination of transaction verified by one node so all the transaction in that block is verified and once node is full node will broadcast it or any node can add transaction in that block?
In the world of blockchain, no one trusts anyone. Transactions in each and every block are verified by each and every node.

Just the node that solves the cryptographic puzzle (In PoW), gets a chance to append a new and valid block to the blockchain. Which in turn will be verified by every node.