Which actress portrayed Dr. Grace Augustine in the James Cameron movie "Avatar"?
Explanation
Sigourney Weaver portrayed Dr. Grace Augustine in the James Cameron movie "Avatar" because she was chosen by the director for that specific role. Known for her strong on-screen presence and memorable performances in science fiction films, Weaver was a perfect fit to bring the intelligent and determined character of Dr. Grace Augustine to life. Her exceptional acting skills contributed to the success of the film and solidified her place as a notable actress in the genre.