Can Bojuka Bog's triggered ability be responded to before the graveyard is exiled?

Bojuka Bog has a triggered ability that triggers when it enters the battlefield: 'When Bojuka Bog enters the battlefield, exile all cards from target player's graveyard.' Like all triggered abilities, it goes on the stack and players receive priority before it resolves (CR 116.2, 603.3).

This means after the ability triggers and is placed on the stack, each player — starting with the active player — receives priority and may cast spells or activate abilities before the graveyard exile actually happens (CR 116.3). The graveyard is only exiled when the ability resolves.

Common responses include casting instants from the graveyard using flashback, activating abilities that use graveyard cards as a cost, or casting spells like 'Snapcaster Mage' to give a card flashback before it gets exiled.

Concrete example: Your opponent plays Bojuka Bog targeting you. In response, you cast 'Snapcaster Mage,' targeting 'Counterspell' in your graveyard. Snapcaster resolves, giving Counterspell flashback. You then flash back Counterspell to counter another spell — all before Bojuka Bog's ability resolves and your graveyard is exiled.

Note: If Bojuka Bog somehow entered the battlefield with its trigger on the stack already resolving (impossible in normal play), there would be no window, but under normal rules there is always a response window after a triggered ability is placed on the stack.