The mouth, stomach, small intestine, and large intestine. Containing hydrochloric acid and digestive enzymes.
Answer:
the central nervous system
Explanation:
The nervous system is made up of the central nervous system and the peripheral nervous system: The brain and the spinal cord are the central nervous system.
The word biology comes from the Greek word <em>bios</em>, meaning life, and <em>logos</em>, meaning study.
