### system:

Active system
* are costly in terms of chemicals, equipment, and labor
  - robots that realize part of the intervention autonomously
* emit their own radiation.
* rely on a pump to flow nutrient around the plant's roots and to provide aeration.
* use pumps or fans to move heated air or water through the home or building.

Agricultural system
* All agricultural systems are, in fact, anthropogenic.
* are nearly as distinctive as housing patterns.

Aquatic system
* are much more efficient at transferring energy to the next feeding level
  - particularly important as early indicators of ecological decline
* can decompose reasonable amounts of organic wastes without harmful effects.
* operate in a similar way.

Autonomous system
* are independent and exercise self control.
* use exterior routing protocols to route packets to other autonomous systems.

Belief system
* All belief systems are human-made belief systems.
* Most belief systems have a dumping ground for unacceptable ideas.
* are an essential and natural characteristic of any individual
  - areas
  - expression
  - information
  - like stepping stones over the quicksand of ignorance and amnesia
  - usually so structured that leadership is always right
* can be sacred or secular
  - exist after people have left their home countries
* disappear slowly.

### system:

Biological system
* All biological systems differ
  - have inherent variation
  - require water to be transported through cell membranes
  - start with the basic building block of a cell
* Many biological systems give rise to phenomena at overlapping spatial-temporal scales.
* Most biological systems have a low tolerance for high temperatures.
* are among the most complex known
  - fundamentally warm and wet
  - inherently complex and difficult to understand
  - much more complex
  - often the inspiration for supramolecular research
  - truly dynamic systems
* can clean polluted water and even extract heavy metals
  - undergo snap transformations
* exhibit prominent behaviour at the levels of both individuals and populations.
* function like radio sets, by coresonance.
* have a past.
* make extensive use of such structures.
* provide for a rich arena in which such phenomena can have great effect.
* respond to stress by adapting.
* suffer diminished capacity to renew themselves.
* use crystal protein synthesis to record data.
+ Supramolecular chemistry: Chemistry
  * It focuses on the chemical systems made up of a discrete number of assembled molecular subunits or components. The degree of electronic coupling between the molecular component remains small with respect to relevant energy parameters of the component. While traditional chemistry focuses on the covalent bond, supramolecular chemistry examines the weaker and reversible noncovalent interactions between molecules. These forces include hydrogen bonding, metal coordination, hydrophobic forces, van der Waals forces, pi-pi interactions and electrostatic effects. The study of non-covalent interactions is crucial to understanding many biological processes from cell structure to vision that rely on these forces for structure and function. Biological systems are often the inspiration for supramolecular research.

Body system
* All body systems are influenced by the nervous system.
* Most body systems contribute to homeostasis of the body.
* are at an early stage of development and unable to cope with stress.
* covered include nervous, endocrine, digestive, urinary and reproductive.
* discussed are integumentary, skeletal, muscular, cardiac, and respiratory.

Business system
* Many business systems are primarily information models, and the information changes rapidly.
* are social as well as economic.

Cardiovascular system
* ageing The cardiovascular system is composed of the heart and blood vessels.
* contains heart, vein, artery and capillary.
* slows down.