Fact 1: All cells share some of the same structures and basic functions.

Fact 2: Biological structures are too complex.

Given the two facts above, answer the question "What do all cells share?" with the following options: 
- basic function
 - Veins and arteries.
 - exact structure
 - how they look
 - energy usage
 - Electrical energy
 - types of protein
 - Chemical energy


 

 basic function        