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www.reference.com/science/definition-organ-systems-cfc503aaf182213c

Very simply put, the definition of an organ system is a group of organs that work with one another in order to achieve or perform a particular task or set of tasks. The human body has the following major organ systems: circulatory system, digestive system, endocrine sys...

www.reference.com/article/definition-organic-activity-5e3ce054639450f2

Organic activity, with regards to weathering and erosion, is defined as the activity of plants and animals that cause physical weathering of landforms. This activity includes tree roots growing into crevices, lichens growing on rocks and animals burrowing into dirt.

www.reference.com/article/definition-cause-effect-2f04d7b278b37420

The definition of cause and effect is when one event or actor (the cause) produces a result, impact, or change (the effect). The relationship between the first event and the result is said to be a causal relationship.

www.reference.com/article/exact-definition-organic-food-874302bb1cc98348

The term "organically grown" means that the food in question, such as a fruit or a vegetable, has been grown using only natural (i.e., not synthetic) pesticides and fertilizers. While technically, any food can claim to be organic, only those that are certified organic t...

www.reference.com/article/organism-72afb49e8ab12263

An organism is a living entity composed of many interrelated components that work together to achieve a common goal. Organisms come in a wide variety of sizes, shapes and lifestyles, but they all share some similar traits. All organisms require food and excrete waste, g...

www.reference.com/article/causative-organism-aids-30af0de762d1c0f3

The organism that causes AIDS is HIV. CD4 cells, which help the body fight disease, are destroyed when HIV develops into AIDS.

www.reference.com/science/causes-organ-failure-3c5d07f7260b3558

According to the American Thoracic Society, organ failure is caused by various factors and conditions, including loss of blood, poisoning, serious trauma, drugs, leukemia and acute illnesses. Organ failure can occur within one organ or multiple organs, depending on the ...