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Organisms Living in Symbiosis With Humans

The term symbiosis describes long-term relationships between different organisms in nature. While symbiosis can describe parasitic and neutral relationships, it often describes mutually beneficial relationships between organisms. There are few symbiotic relationships between humans and other organisms necessary for human survival, however, many enhance our way of life.

Intestinal Bacteria
- The human intestinal tract is filled with trillions of microscopic bacteria that aid in digestion. These bacteria feed on consumed food products, but also aid the body in improving the immune system, fermenting waste products and helping to prevent the growth of other bacteria that would be harmful to humans.
Agricultural Crops
- Many types of agricultural plants benefit by human labor and farming techniques. For example, agricultural corn (or maize) lacks the ability to flourish and reproduce without the tilling, planting and harvesting labors of human beings.
Domesticated Animals
- Domesticated animals live in a symbiotic relationship with human beings. Pets, often domesticated canines, felines, birds, rodents or other varieties, receive shelter, food and care from humans, while humans in return receive the emotional benefits of companionship. Animals such as cows, sheep, pigs, goats and chickens have flourished as species -- been an evolutionary "success story" -- even though we consume them for food.

Animals & Science