Polyandry occurs in various cultures around the world, the practice involving a single wife with multiple husbands. Polyandrous relationships often involve men who know eachother (e.g. siblings, extended family, or friends). The harsh mountain existence of Tibet has driven parts of Tibet to engage in this practice, with multiple adults needed within a household to ensure survival
When Charles Darwin created the phrase “survival of the fittest”, he did so before the term “ecosystem” was commonly used within the English vernacular. Darwin originally intended to state that the species or organism which fit in best with its environment, would have the most probable chance of survival. It is a common misconception that Darwin was referring to physical attributes like strength, speed, and fight or flight endurance