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.
An antihero is not your typical hero because he doesn't always possess purely good qualities or personality traits. For example, while a hero is courageous in the face of battle, an antihero might be afraid. While a hero is perfectly handsome, an antihero might be too short, too hairy, or too fat. While a hero is self-assured, an antihero might be plagued with insecurities.