DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Fig. Model to show mechanism of breathing. The figure shows a plastic bottle whose bottom has been removed. A tube has been passed by making a hole in its lid. To the forked ends of this tube are attached two deflated balloons. The bottle is sealed in such a way that it becomes air-tight. During breathing

• A. there is no change in chest cavity
• B. there is no change in the composition of gases inhaled and exhaled
• C. breathing is a continuous process
• D. all the above are correct