balls and rods set up to represent a solar system
a set of organs and structures that provide digestion in the human body
the defense plan of a football team drawn on a whiteboard
Which option correctly identifies each description?


I. system
II. model
III. systemI. system, , II. model, , III. system , ,

I. model
II. model
III. systemI. model, , II. model, , III. system , ,

I. model
II. system
III. model
, I. model, , II. system, , III. model

I. system
II. system
III. model