What is the main function of the digestive system? a. to break down food into nutrients that can be circulated throughout the body b. to exchange oxygen and carbon dioxide gases within the body c. to protect the body against foreign substances, such as bacteria and viruses d. to send signals from one part of the body to other parts of the body

The answer is A. To break down food into nutrients that can be circulated throughout the body.

The three main functions of the digestive system are digestion, absorption, and elimination. Digestion is the process of breaking down food into nutrients and enzymes which can be useful for your body. Absoprtion is the process in which blood abosrbs the nutrients that come from the food to the rest of the body. Elimination occurs when the food molecules are abosrbed. Anywatse products are eliminated.  

answer: because barriers look like ball

explanation: there round and blue like my ball

a1 = unhealthy

a2= healthy

a3= healthy