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 definition of a superhero is a made-up character having super powers and abilities. An example of a superhero is Spiderman. pl. -Â·roes. a heroic fictional character, of a kind found in comic books, who has physical and mental abilities, skills, etc. that are either superhuman or superior to those of ordinary human beings.