The esophagus has to be flexible to allow for food to travel from the mouth to the stomach
Because water helps them grow.. when you poue water on a flower is suks the water in and then it goes underground and the soils suk it in and grow 10 cm every day you water them
During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases - this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.
Answer:
If it helps, the answer is Mutualism (let me know if it is for some reason incorrect)
