Here are the answers to the questions:
3) When you start chewing food with your mouth.
4) A tube that carries substances like enzymes, bile, etc.
5) The gallbladder, which stores and releases bile from the liver.
6) a) Pepsin and rennet are enzymes that help break down proteins.
b) The pancreas and liver (via the gallbladder).
c) No, nutrients are mainly absorbed in the small intestine, not the large intestine.
d) Blood vessels.