Which of these has the most complex level of organization? by Sunday | May 18 | Biology WAEC | 0 comments A. Euglena B. Hydra C. Heart D. Virus Correct Answer: Option C C. Heart Users Also Read These:Which of the organs of the United Nations…Which of these hazards would most likely result…Which of these hazard would most like result…Complex social behaviour and organization are found…Which of these require crystallization most?