Which of the following is the most complex according to their cellular level of organization? By: Sunday|Published on: Sep 6|Categories: Biology JAMB| 0 comments A. Heart B. Hair C. Euglena D. Hydra Correct Answer: Option A – Heart Users Also Read These:SS1 Biology Lesson Note on Cellular RespirationWhich of the following structures would carry out…Which of the following levels of organization in…The level of organization of the organism is?Give TWO advantages of complex structural…SEE ALSO A biotic factor which affects the distribution and abundance of organisms in a terrestrial habitat is?