Multicellular Life — Definition & Overview

Which of the following is an example of a multicellular organism?

Picture Credits:

(1) By Cymothoa exigua CC BY-SA 3.0], via Wikimedia Commons

(2) By Kathy & sam CC BY 2.0, via Wikimedia Commons

(3) By Phoebus87 GFDL, CC-BY-SA-3.0, or CC BY-SA 2.5-2.0-1.0, via Wikimedia Commons

(4) By Tony Webster CC BY-SA 2.0, via Wikimedia Commons