to digest food to help in defense to eliminate waste to enable movement
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The human body is composed of different systems made of specialized cells, tissues, and organs. Each of these structures has a specific function that aids in the survival of the human species. What is the primary function of the excretory system?
Possibilities:
- to digest food
- to help in defense
- to eliminate waste
- to enable movement

to eliminate waste