Which number is labeling the part of the digestive system that releases acid and mixes the food to break it down?

If a set of instructions that determines all of the charactersitics of an organism is comparedto a book,and a chromosme is compared to chaper in the book,then what might be compared to a paragraph in the book?

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

List five ways we are indebted to phytoplankton