An organ system is a group of organs that question 8 options: a. are made up of similar cells. b. are made up of similar tissues. (c. ) work together to perform a specific function. < d. work together to perform all the functions in a multicellular organism.

Your answer is C work together to perform a specific function because of the systems in the body has one important body function so that we don't die because are body not right.

Here are a couple of organ systems that keep us alive...
.Digestive System
.Executory System
.Circuitry System
.Nervous System
.and more

They all work together to keep are body functioning properly.

Also its not A because all cells are different because all of us are different because of are genes its not B because there sometimes different tissue depends on which organ system its also not D because they do work together but not everything is multicellular that's how I came with C.

Your answer is C.

If it doesn't have a nucleus its a prokaryote