Part of a bird's digestive tract, called a gizzard, is able to break up large chunks of food at an extremely fast rate. it is difficult for scientists to watch a gizzard functioning in a live bird. how would building a model of a gizzard a scientist? a. to study bird behavior b. to watch a gizzard functioning in life c. to determine what type of tissues a real gizzard is made of d. to analyze how a gizzard works