How are known the entries that transfer the balances of the revenue and expense accounts to retained earnings?

The entries that transfer the balances of the revenue and expense accounts to retained earnings are known as "closing entries." These entries are made at the end of an accounting period to reset the temporary accounts (revenues and expenses) to zero, allowing for the next period's transactions to be recorded. The net income or loss from these accounts is then reflected in the retained earnings account on the balance sheet.