Giving 20 points! Explain the MAJOR differences between single-celled and multi-cellular organisms and give examples of each.

Unicellular organisms include bacteria, protists, and yeast. For example, a paramecium is a slipper-shaped, unicellular organism found in pond water.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

youre right there are