Which of the primary advantage of instincts such as the tendency of a mother bear to attack anything between herself and her cubs?

The primary advantage of instincts like a mother bear's protective behavior is survival. This instinct ensures the safety of her cubs, increasing their chances of reaching maturity and reproducing. By aggressively defending her young from perceived threats, she enhances the likelihood of passing on her genes to the next generation, thus reinforcing the survival of the species. Such instinctual behaviors are crucial for the continuity of life in the wild.