Version $2$

Killer whales, also known as orcas, are a communicative species. Using distinctive calls and clicks, they chatter among themselves. But when the whales hunt$$a time when scientists hypothesize communication would be of the utmost importance$$they are silent. The orcas seem to understand that their calls alert potential prey, so they hunt with stealth. Scientists are currently studying orcas to determine how they coordinate their hunting efforts without auditory signals.

Which of the following is the best choice for the final sentence of version $2?($Hint: The answer should match the tone of the rest of the passage.$)$

Let$$s hope researchers figure out what these orcas are up to when they hunt.

Perhaps with further research, scientists will gain more insight into this creature and its rare communicative abilities.

Which words best describe the tone of version $2?$

Academic and objective

Invective and emotional