what is an organ system composed of?

Answer:
An organ system is like a group of different organs working together as a biological system. They perform one or more functions. Each of them has a certain job in the body and they're made up of distinct tissues.
Hope this helped!! :)
Option D. different types of cells combine to form a single structure.
Organism: Individual living thing that may be made up of one or more organ systems.
The body includes nine major organ systems, each composed of various organs and tissues that work together as a functional unit.
Learn more about organ systems composed at
https://brainly.com/question/17731486
#SPJ2