How was it possible that the doctors could still the patient awake without the patient feeling the surgery

By giving putting the patient under, giving the patient anesthesia.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

answer; i believe the correct answer is (replication is not conservative);