Which of the following is the most complex according to their cellular level of organization? by Sunday | Sep 6 | Biology JAMB | 0 comments A. Heart B. Hair C. Euglena D. Hydra Correct Answer: Option A – Heart Users Also Read These:Organisms in an ecosystem are usually grouped…Complex social behaviour and organization are found…The complex relationship between the members of a…Which of the following structures would carry out…Which of the organs of the United Nations…