Final answer:
In biology, "tact" refers to a defensive behavior exhibited by animals, such as ducks, in response to the presence of a predator.
Step-by-step explanation:
In biology, the term "tact" refers to a behavior exhibited by animals, such as birds or ducks, in response to the presence of a predator or threat. When a duck senses danger, it may quickly lower its body or head, and sometimes even dive into the water, to avoid being seen or targeted by the predator. This is a defensive strategy that helps ducks reduce their risk of being attacked.