10 most extreme places on Earth. A unicellular organism is any life form that consists of just a single cell. This group includes most life on Earth, with bacteria serving as the majority. The main groups of single celled life are bacteria, archaea (both prokaryotes), and the eukaryota (eukaryotes).
A hero (masculine) or heroine (feminine) is a person or main character of a literary work who, in the face of danger, combats adversity through impressive feats of ingenuity, bravery or strength, often sacrificing his or her own personal concerns for some greater good.
The anti-hero is often a reluctant hero who does not consider himself capable of accomplishing the goal. He might be selfish, addicted, corrupt, sullen, or disaffected. By the end of the journey, he typically transforms into a fuller, happier, or more complete person due to the struggles he endures.