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 help a scientist?
A. to analyze how a gizzard works
В.to study bird behavior
C.to determine what type of tissues a real gizzard is made of
D.to watch a gizzard functioning in life
